I spent most of my twenties dying my hair, changing my look, hanging round with the wrong kind of kids and just generally trying to be someone I wasn't. Some people call this experimenting, I call it a waste of time as I was just trying to do all these thing to impress other people, none of which actually made me happy.
It took a long time to get here, with a few major hiccups in between (probably the time I decided to live in Beirut to name an example) but I got here. I'm finally comfortable with just being me, flaws and all. It's something I really wish I could go back and tell my younger self, but instead I'm telling you. Don't try and be someone you're not just to fit in or impress someone, because no one can do you better than you.
Don't try and change your face, lose weight, or strive to look like someone else just because society tells you that's what is beautiful. Someone out there will think you're beautiful without the hassle and up-keep of transforming yourself into a clone.
The most attractive thing in the world is confidence. Not the type where you walk into a crowded room and command attention but an inner confidence where you are proud to be yourself and you just don't give a sh*t what anyone else thinks. So be at peace with your flaws as you're probably the only person that sees it as a flaw.