Do not compare yourself with anyone else. If you can be happy in your own skin, then that is all that really matters. I can remember, many, many years ago a friend coming to visit me. She was the last word in brilliant figure and smart dress. I had just given birth to my third child in four years, (all welcome and planned children), but felt, dumpy and frumpy. During the visit she broke down in tears telling me of a disastrous relationship breakup, illegal abortion, resulting in her nearly dying, now back at home with her parents who had to pay to get her to private doctor to try to make the best of the boched abortion. She was now unable ever to have a child. Made me realise how little looks matter.
Also, many years later my best friend was a health freak and went to the gym 3x weekly, and ran before brekkie each morning. Did a marathon when she was in her mid-60's. Soon after her 70th birthday she died from cancer, - by that time was depending on stick when I was out, and could not run anywhere at all. Since then my mobility has got worse, but ten years later I am still alive.