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 guess snow is my thing now, and there is still a little left. [F38, 5'8", 135 lb, one child] I don't like the squinting but it's hard to avoid in strong sun so it's ok.