I can relate to a lot of this.
I trigger so much at the thought of being lesbian or bisexual. It frightens me. I get aroused by watching vagina's get licked, masturbated or sexed, but only by men. I've come across lesbian porn before because my fetish is oral (women being licked). I also REALLY love sucking my boyfriend off. I'll do it as much as I can.
But as soon as I think of touching or licking a vag, it makes me feel sick. The thought of kissing a woman makes me feel sick. So I'm very confused by my own thing. With the groinal response, I get a response on my clitoris (the good feeling bit which is usually licked). I've never actually ever described where the response is, but that's where I get it, in my clit. I always have got the response there.
If I don't get anxiety by women or children and the groinal response towards them, I force the anxiety there. The other day I was masturbating and a friend of mine told me she'd masturbated the day before. And suddenly I had an image of her masturbating herself, but laying in the same position as me, so it's almost like I was watching myself??? I'm not sure. I get off to the woman and man moaning in porn videos (I don't watch porn in a relationship however, I see it as cheating) but when I did watch porn. Me and bf made porn videos together so he could still whack off when he needs to without me feeling like he's being unfaithful, but I wasn't turned on by them at all really, but I was so focused on how fat my body looked and stuff. So anyway I've never done anything with a woman, and never will. I don't want to. And I'm pretty sure it's the same with kids too! But I hate being "unsure." Sometimes I'm absolute sure I won't, then other times I just don't know. It's a never ending nightmare.
I've had the same thing, where I've wanted to be the nurturing mommy to small kids, and the mentor to older kids. It means we're normal!
Your POCD started the same as mine. I'm 23, female. Mine started when I started working with kids. Like you I don't wanna be near kids now either.
How did you come to realise you were bisexual? Like I get groinal responses to womens vag's. Have since I was 11 and I saw lesbian porn. It was crazy. But then I got an equally matching groinal response when I heard my parents having sex at the same age. That's why this is so confusing for me. I'd never actually go with a woman, so why does the visual make me so horny? Is it because I know how good the clit feels to be touched? Probably. I hope that's all it is. I'd be devastated if I turned out to be bi or lesbian. I love my boyfriend so incredibly much.
If you're ashamed and feeling guilty, you're not a pedophile

I promise! You wouldn't be satisfied with the thoughts of kids. It's the anxiety arousal that makes us orgasm fast. My images are also the same. There's no movement. It's a still fleeting image, but if I remember my boyfriend being on skype and taking the cover off of his body slowly, it drives me crazy. Arousal in my chest, groin, shaghole, everywhere. I loved it, and I love remembering that.
You haven't really gotten off to images of children. When we have sex, many images come into our brains. I've had friends and family pop up. I used to have extreme groinal responses towards my mother too. Anything she did or said I'd twist it into something sexual. I also watched this program where people did an experiment to find out if people were really gay or straight, and wired up these adults and made them watch porn to see what they responded to. Some of the women turned out to be lesbian because they were extremely heated over lesbian porn and not so much over hetero porn. That triggers me when I think about it.
I love the feeling of masturbation too but stop after one time because I get sore otherwise. Sometimes once is enough but sometimes the feeling comes back immediately after. It's tough being a woman! Even as I type this I'm exhausted with all this horniness flowing in my system. I want a break from being horny. I only wanna be horny over my bf, not over womens bodies. I know I'm jealous of women who are skinny with big boobs, really jealous. Maybe that's another reason. We're all normal in the end.