A very important disclaimer. I'm 18 and currently going to a new highschool. Will keep the post as short as possible.

I'm almost at the end of my penultimate year now. It was a new school that I knew nobody from, and was a fat, timid, sexually and socially inept individual. After being tired of being a beta slob who'd fuck up every sexual encounter I decided to better myself and my attitude. People didn't like it and told me to knock it off. Girls found it creepy that their "best guy friend" started hitting on them. I screwed up after asking out a couple of girls who were not interested and word got out, and I ended up becoming a school joke, basically. When my oneitis lost interest in me due to hesitation and overthinking from my side, I fully understood that I needed to swallow TRP wholly and entered a very deep anger phase that helped me tone my body and bring out a cocky/funny attitude, but it ended up angering the popular groups and got me more or less ostracized from them.

I joined the football team, and hang out sometimes at school with the guys from there but other than friendly chit chat I never get invited to any parties or outings by, well, anybody. My own sister even joined the fest of taking a shit on me, and I've been universally labelled a "fake", because I'm not "being [my] true self" and that me having sexual desires "just isn't me".

I can pull chicks outside of school fine, never went past making out though, but in school nothing seems to work. Everybody here hates me and does not treat me with respect. I cope with adopting the strong silent type persona, and mostly just detach from what happens at school, including ignoring this ex oneitis and generally everybody if I don't have something to add to the convo / not being engaged.

How do I go about this? What is your advice for the situation I find myself in? If I need to clarify on some things, let me know.