How do I deal with not being liked a

Decided to put this on here because it’s there’s more people my age that maybe could relate to me. I’m 18, I’ve got no friends and no social life (I’m not asking for any haha) I left school at 14 due to bullying and mental health reasons. When I was in school everyone treated me like I was simple and idiotic (i used to get 0% on every test even in the lower level classes when I was in school). I’ve had 2 girlfriends over the years and both left me for other blokes and they aswell treated me like I was stupid. Every interaction I have when I’m out in the pub or the shops is a negative one, it’s always someone making a snarky comment or being a bellend in general, just today I’ve had someone aggressively make fun of my outfit, I’m a mod which is alternative so I wear parkas and doc martens and have my hair different which I’m very proud of and I won’t change but I’m sick of negative interactions everywhere I go. I’ve got anxiety and agoraphobia aswell. I live in a small town and everyone knows of me but couldn’t give a shit about me, whenever I view people’s profiles on tiktok that I know round the town they either just ignore me or block me. Anyway long story short everyone seems to not like me or give a fuck about me and I’m proper lonely haha