Why do I suddenly feel this way?

Last year in 7th grade I felt shy and a little but confident? Im not ugly at all,im actually pretty.I didnt have a boyfriend last year.But this year i feel SUPER confident and i feel like i can get ANY guy i want for some reason? Is it a power trip because Im now the upperclassman? Did i get prettier? Did i finally figure out who i am? Im going to get my braces off before school starts. Will i be on another power trip after that?