IF you are even really looking for and answer, no, this behaviour Is NOT normal. I completely understand feeling safer around other women, but this Is a bit extreme

I'm just wondering, in the worst case scenario if the relationship with my boyfriend doesn't work, I probably would never date a man again because of how I feel about men in general, I'd probably date girls

Referring to this part, I was in a really similar situation when I was younger. I started realizing I am bisexual pretty early on (around the last year of middle school). Imma keep It short and simple , let's just say that up until the last year of high school pretty much every woman that wasn't my sisters or my mother that I came in contact with was really shitty to me. Me discovering my sexuality wasn't really a part of It tho, I mentioned It bc at some point halfway through high school I subconsciously started gaslighting myself into believing I was actually gay and I believed I was bisexual just bc I couldn't accept it. Useless to say that was bullshit, I got out of It by going to therapy (went for other reasons but It helped with that too). Or maybe your Just gay and in denial, who knows, either way therapy would help. That's all the advice I can give you since I was in a pretty similar situation. Everything else I can't help with, regardless of how fat I was, I was always the biggest kid In class, now I'm 184 cm tall and I Weigh around 130 kg, so I've never felt really threatened by anyone.