self-esteem related anxiety

sososo... where do i begin? i’m 12 turning 13 in december. i’ve been on meds since december for my mental disorders but i still have constant anxiety and a majority of it is about what other people think and i have no clue how to stop it. i wear loads of makeup, dye my hair, etc and still think i look god awful and i can’t go out in public like that. i just wanna feel comfortable in my own skin.