I think it's particularly hard these days with all the flawless images being pushed by social media. And it's all fake - filters, lighting, editing, makeup etc. We all have flaws and that's perfectly fine. I have grown to value what's important and when you surround yourself with people who love you as you are, 'skin perfection' fades in the background.
We always tend to compare ourselves to others, but trust me, someone looks at you and thinks 'I wish I had hair/legs/eyes/smile like her/him'. We all have insecurities!