How to accept myself and move on from traumatic past?

Hey guys. I'm a 27 year old guy. I've been bullied in high school due to my appearance and stupid behaviour. It's been a decade since the time passed but I'm unable to move on. I'm short and dark skinned . I used to be sick frequently due to asthma. All this lead me to be a weak person and eventually and easy target of namecalling and all. It was so tough , I even ended up bullying another guy who was awkward just out of frustration.

I've never dated or been in a relationship with anyone. I feel like my confidence is badly shattered to approach.

I work dead end jobs, and recently quit one.

I find that I'm still stuck back there and unable to move forward. It's like whatever I'm doing is being judged , it's like everything I'm doing is to prove myself. Please help me. It's really tough .

P.s : if the post doesn't belong here , please suggest me some good subreddits where I can get help. Also, apologies if I made an error, English isn't my first language.