all the time! There are many things about our bodies that we CAN change, but a lot more we can't. We have to learn to accept & love ourselves & stop comparing because everybody really is different.
Maybe try to look at your negatives in a new light. I always say, "yeah, she may be skinnier than me, but I bet she isn't as strong either." Stuff like that. Look at what your body can do for you & how magnificent it is in it's uniqueness.
Hope this helps a little at least.