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)
Natural and relaxed, a little bit out of comfort zone. If you look closely, you can see my pregnancy stretch marks. [F38, 5'8", 135 lb] The picture is meant for editing some small animal into my hands, hence the pose.