Oh dear God, WHAT HAVE I DONE?!

I just sent someone I've liked for YEARS an e-mail admitting that I'm attracted to him. I even asked him out. I'm still in a bit of shock that I did it, but I did. Now my only fear is that I've just ruined our friendship. We went to university together, chatted, texted, e-mailed each other back and forth, and I never told him how I felt.

Well, now I've told him how I feel, and I don't know what to think.