I’ve been in the same boat. Since I was 13 I became really self conscious of my appearance, mainly due to other people’s comments, and then that was exacerbated from 16-18 during college because people got meaner for some reason. I felt terrible, and the lockdowns unexpectedly saved me as it gave me a break from all those people.
It made me realise I should only stick with people who like me for who I am, not how I look. Then ignore all those comments and ignore those people, make them feel awkward for saying those things if they do. Even if people aren’t saying comments, just think less of what others think of you.
You are what you are, don’t try to change your appearance just to please people who might not care much about you in the first place. Don’t let your appearance bring you down, ignore those annoying flaws and be more confident to outshine any imperfections you think you might have. Don’t be afraid to do things you enjoy and spend time with new people.
Ofc others may have different advice as my problems are either impossible to change or very difficult to, so I’ve learned to be content with how my body is, and just play with the hand I’ve been dealt (which unfortunately means I’m not perfect at this and for instance still wear more clothes than others during the summer). But I’m generally very happy now with lots of good friends who like me for who I am.