Girls how do you give yourself a confidence boost?

[I love winter!]

I go to school with a lot of bimbo's/superficial girls. When ever i am feeling a little down about myself
I just listen to some upbeat music. Lady GaGa is a favorite of mine. Also i put on a spritz of perfume to. That also seems to lighten my mood. So what are your secrets do get your confidence a boost?

Thanks
shannon