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)
I used to be very subconscious about the one side of my labia being longer then the other and the dark pigmentation. Subs like this helped me realize how normal that actually is! [F 32 167lbs 5ft]