I begged my friend to punch me in the face when I was 15
What was your reason for wanting your friend to punch you in the face?
I was so afraid that I might be gay that I wanted to give myself a test.
Asking someone to hurt you in order to determine if you are gay or straight can be a harmful thing to do, not just physically but mentally. If you are struggling coming to terms with your sexuality, talk to someone who understands what you are feeling and don't self harm.
I didn't think it would hurt that bad. My friend punched me where I might have been gay.
Well punching normally does hurt no matter what part of the body it happens in. You should avoid having people hit you. It could case a serious injury that requires medical care.