Have you consciously decided to be schizoid?

The question asks purely about behaviour, which makes it hard to distnguish it from avoidant behaviour and therefore from AVPD. SPD itself tho, at least according to the psychological theories, is a defensive structure which develops so early that it would be hard to call it a conscious decision.
There is nevertheless something called secondary schizoidism which can - or so I assume - only develop if there is already a borderline organization present and there is a specific regressive action that creates a SPD setup in the mind. But this, too wouldnt be an intentional activity with the goal of becoming schizoid, but an internal calamity, which cuts off an essential part of the personality.

I think the development of all personality disorders necessarily involves superficial choices (with big and long-lasting behavioral consequences) that mask your impotence to be what you understand as appropriate. Obviously you don't choose the latter. And whether or not those superficial choices are a conscious personal choice becomes a philosophical question, because chances are they were closely dictated by your survival instinct, and only rationalized later on as personal choices.

UK SPD wrote:No.

To be less succinct and to clarify:
We may not consciously decide to be SPD, but once we come across the label there may be a subconscious tendency to fit into that label, if it appeals to us.
It's all about self-identity, self-discovery and self-delusion.
I suspect that self-delusion has the strongest effect, and that it's self-delusionary to imagine otherwise.

Yes, but not with this objective. For example: My jaw is different, it is so wide it influences my speech in a negative way. When I was younger, a lot of the words I spoke, people didn't understand, making me have to repeat lots of time. So, since I didn't like to talk, I began to communicate in a non-verbal or less verbal way, to avoid fatigue. The problem is that children my age didn't understand my non-verbal language most of the time(which was clear to adults), so they didn't want to try to interact with me(most of time). This was probably one of the things that distanced me most from social interaction in childhood.

Another maneuver I did in childhood was not talking about my interests in common with other children or even talking about the interests I had and few children(almost none) knew what they were, to avoid repetitive and boring conversations, and it still works.

I wish! But, no. Im the real deal, combined with a hint of borderline. It's a cocktail of two very opposite personality disorders, that is making my life a hell. Sorry to say.

Kind of; I think becoming Buddhist and dedicating my life to meditation caused it.

I'm not sure. I've heard that people can put themselves through depersonalization. I can take myself out of an alert state of I decide to, and I did that a lot as an adolescent. I would think to myself, "I'm not here, I'm not here," and I'd here a loud sound go off in my head like a bomb then I'd sort of be in an altered state. I think of it more as meditation and not an active desire to be schizoid. I can sort of go away now if I want. It's just a skill that I've honed over time.

I think it was kinda the only solution for me. I had a lifetime of bs that made me develop trust issues, and cause me to realize the more emotion I exuded the worse things became.

Gonna go ahead and throw in a trigger warning.

I was always a kid who was more extroverted yet had a hearing disability (auditory dyslexia) that wound up eventually giving me selective mutism until around college. It kinda turned into a sort of lil Mermaid thing where I wanted to be around folks, but didn't feel like I could survive it (still like this.) I was constantly misunderstanding what people said to me. My mom told teachers I had a learning disability, so kids automatically went about making fun of my bad grades. My parents only told me that I had a learning disability, so I thought I had something like down syndrome until I was in 7th grade when I started homeschooling and mom told me it was only a hearing problem. I learned how to read lips and my grades skyrocketed. Things then became an issue where my parents both upped their tiger parenting as if I would suddenly turn type A like them. If I missed one thing, I had to rewrite it over 100 times. I was an only child, and parents often left me home alone. My mom would always go through my things too in case she I guess could find something to be melodramatic about. I'm sure it was hard for her too, since I had no friends, no car and we lived 20 minutes away from civilization. Sure mom I found a carrier pigeon of a man that does drugs, cuz why not?

One kid in my school basically controlled the whole school due to her parents donating a ton of money. She knew she could get away with anything and did anything and everything she wanted including, sexually abusing several students, claiming a student she didn't like wished to rape the teacher's daughter to get him thrown out, and attempting to kill a couple of fellow students (thankfully the teachers found out about the rat poison in time.)

My dad is both OCD and bipolar. My mom has Munchhausen's by proxy. She always seemed to make sure his doses kept him in zombie states or she'd do stupid things intentionally to set off his manic episodes ones so she could play the victim card and try to convince me of him being a terrible person. She found out that certain food allergies messed me up without killing me so she'd make me eat it without letting me know that was why I was so tired and congested all the time. My school bully only made her happily call other adults who's children didn't go to my school and tell them how she only had me there because I wanted to be with my friends (cute mom, but I didn't have friends there). When she tried getting me on anti-depression meds I refused knowing she'd likely like to the shrink, and they'd give me the wrong script like she did with my dad.

My marriage was a gender-bender Gone Girlesque nightmare that lasted for 7 years and ended with him in a mental institution. The details would be pages long so only gonna say that I'm glad he couldn't fake being pregnant because I'm sure he would've tried it to keep us together. I've moved out of that state and been slowly getting better since.

My OCD got me into looking through things on the internet and I landed on the term schizoid. My boyfriend agreed it fit. He'd been worried about how I needed so much "me time" and hear me talk to myself quietly as if I were talking to others.

I still tend to call my mom weekly due to her once filing a missing person's report from out of state when I went silent for two weeks. She said I was being silly about a therapist until the day I was to go to my first therapist appointment my therapist had to cancel, and I wound up making the mistake of watching the last episode of the BBC's Sherlock. I called and compared my old bully to the woman in the last episode, and how similar my personalty is to Mark Gatiss' version of Microft. That was when she finally admitted I was right, and actually sent me old medical records including how she found out the things I was allergic to. Didn't even know until last year about some things, because she never told me. At least that gave me some closure that I never expected to receive.

Consciously?
I dont really know. All i know is there was time where i was the complete opposite of what i am now.
One day, i had a change of heart. And before i know it, it was too late.
After a couple of years i learned about schizoid personality disorder.. all pieces fitted perfectly.