It took me until my 50s to stop being self-conscious about my slender body and skinny arms. Exercising more helped a bit but it was mostly in my head. My advice - love yourself now! (The sign was for a Twitter pro-nudity campaign)
[F, 30, 140ish, 5'6"] I've had body image issues for many years now, but recently I've been more accepting of myself. I still feel self conscious but this sub has helped a lot