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)
37F/140lbs/5'8" - been battling body dysmorphia/eating disorders most of my life; I've finally begun to accept and love my body, imperfections and all. 💛