Well, you probably came across this but remember that AS is on a sliding scale, shared with Autism and PDD-NOS. In other words, think of all these as weights, if you have enough of the symptoms, you are then on the scale (so the scale is giving a reading), add on more weight (more symptoms, worse symptoms) and you increase the weight. You start out around PDD-NOS (Basically aspergers), and move into the Aspergers realm, and eventually to Autism.
To summarize, you don't need to have every symptom to be on the scale.
Do you have Aspergers? Dunno. If you're concerned about it, you should go in and get evaluated. You could very well have PDD-NOS. This...in my opinion, is basically Aspergers where the difficulties aren't super extreme, or as thorough of a diagnosis. Technically my diagnosis is PDD-NOS. I surprised some people saying I had Aspergers because they wouldn't have guessed.
I'll go through your reasons why you may not have it one by one:
* When AS people are referred to as 'robotic', I don't identify with that at all. I don't know if I seem that way to others, but I feel extremely emotional and sentient.
Do you give a lot of hand gestures, facial gestures, look directly at people, etc? Robotic doesn't necessarily mean walking like a robot. What this more means is do you give less of these non verbals. You say you're emotional, if you would ask other people that question would they believe you're emotional?
Speaking for myself a bit. I give fairly low eye contact in many cases (but this depends on mental state, some days are better than others). I am not seen as emotional by others, yet I believe I have quite a few emotions going on. I very rarely express them though.
* Rather than not recognizing metaphor, subtext and taking people literally, I am always convinced I know what someone is 'really' saying, I always hunt for the hidden meaning, and usually assume it is something negative. It's hard to convince me I'm wrong, but maybe I'm just very damaged.
In regard to metaphors, those are things you learn over time. This usually applies to younger people, who have a hard time picking up on this stuff. Eventually, you do learn the metaphors people use and can kinda "get it". I wouldn't put too much weight into this.
The part that you're saying..where you're assuming people are being negative, is a bit concerning. I wouldn't say this aligns with AS, but definitely points to trust issues. this may relate to why you never had a relationship. The question you need to go after on this is the true reason why you haven't had a relationship. Do you actually desire one and it's a matter of trusting someone? Is it actually out of non-interest? People with AS can, and often do, desire more human interaction despite the fact it feels "odd". Not everyone though..and the level of social interaction for those with AS is often less and desired less, than NTs.
* The technical processes of things like computers, phones, manuals etc, are not easy to me, my brain just turns off and loses interest when confronted with technical information.
Computers, phones, etc all point to the idea of predictability - and the desire for predictability. This doesn't mean you need to like these to meet this criteria. Do you have routine useful, and get stressed out when the routine changes? Do you notice more patterns even in artistic or in general life stuff?
For example, I've counted the steps from one floor to the next in the engineering building for fun once. I also counted the steps it took to get to the lab I work in. Noticed some interesting patterns for speaker covers in the dentist's office, and was curious why they "messed up" in some ways. These have nothing to do with computers, but you may associate with.
* Supermarkets do not terrify me, unless they have horrid dim artificial lighting and dreary aesthetics, even then, they just depress me.
Anxiety and AS overlap, but this has more to do with social anxiety than AS. You don't have to be fearful of supermarkets to have AS.
* My brain doesn't store numerous facts when I'm obsessing, I store visuals, and my obsessions are usually visually oriented.
There's a post a few topics down that talks about this. "ways of thinking" or something to that effect. You should read that. Lots of people are visually oriented, on the AS scale too. If you're storing "numerous visuals", you fit as well.
* I don't act oddly in public (as far as I'm aware). I don't rock, or tap, or flap. I get very childlike when I'm excited and jump up and down and sing, but I always assumed that was normal.
I mess with my hands a lot when I'm nervous and in public, but most people I've talked to think I act normally enough in public.
As far as being childlike..yeah, I am too, in way too many ways. Jumping up and down and singing? yeah, I do that sometimes too.
* I usually get jokes, I watch a lot of comedy and I laugh at the funny bits, don't much understand this one.
Sarcasm is usually pointed at more than jokes for this one. The fact you get a joke and laugh, that's fine. The question is how easily do you get sarcasm? There's someone I know on the scale further than I am, and she gets the sarcasm I give toward her. I also get sarcasm in some situations, but not others. My boss has had to say quite often that "i'm joking", because I wouldn't get it.
* I can tell when I have gone on too long and the other person is losing interest and getting bored, but then that could be another negative assumption. (I make a lot of these).
Again, this is a learned trait. You may have picked up on it over time. I can also tell when the other person's lost interest, but I'm not sure how quickly I'm able to tell it. They may be making it more apparent, maybe not, I don't know. I tend just not to talk to too many people if I can help it.
*Can't remember the rest of these right now either, but there a few things that keep popping up that I don't even understand, let alone identify with.
And you're unlikely to identify with everything.
Gotta keep in mind here..AS is really only worth getting diagnosed if it's something that's negatively impacting your life, or if it's something that you can learn from and use to your advantage. AS isn't a badge of any kind and if you don't believe your life will improve with the knowledge of yes/no, or be helped at all, then don't go with the diagnosis. We, in this forum capacity, can't really tell you if you have AS or not, though.
Hopefully this helps.