You show great potential and should absolutely go to art school. Narrow it down to 5 or so schools you might want to go to. If you don't go to art school, you'll never develop the confidence in your talent that you lack. You will also miss out on meeting other people who share the struggle to define themselves as artists. Don't feel intimidated, just start sending out your portfolio.
The whole purpose of an art college is to help you grow.
I hope you follow through.