everyone is 'pretty' but in thier own way. make-up is a lie tonen people u are who u aren't. like Dr.Suess once said, "Be who u are say what u feel because those that matter don't mind and those that mind don't matter." so it doesn't matter if you're 'pretty' of not because every one is, just not in the same way.
I don't think that it's something that anyone can explain to you; u have to find it inside yourself. Ask yourself, 'what makes me beautiful?' and lijst three things every morning that u love about yourself.
Lol, just like yourself. No matter if u think you've accomplished your goal of being as "pretty" as u want to be, there is ALWAYS going to be that one judgemental jerk that doesn't like the way u look. Instead of trying to look at what other people define as "pretty", find your way on your own. It's far better than anyone else could come up with. :)