The best way is to come to terms with your own self-esteem.

You'd be amazed how easy it is to talk to people (even girls) when you realize, you don't give a f*ck what they think.

I'll repost something good I saw recently:

"Instead of wondering whether she will like you, wonder if you will like her."

It's all about just changing your perspective.

Nothing she can do will actually affect you. You may feel burned, a little, but guess what? It will pass! Isn't that a relief? No feeling you could ever have could possibly last forever. It's easy to think that by changing the present you are setting the future. You are not. You're just changing the present. So have as much fun with it as you can, because one day, you won't be able to, you know?

Peace.