Afraid of Orgasm.?

You guys, this is probably going to sound super weird, but like I'm absolutely afraid of having an orgasm.. I'm 20. Anyways, I enjoy sex, but when I start to climax I get freaked out and will literally stop masturbating, or stop oral, or stop sex.

Sometimes I even feel like I'm going to pee, and it's awkward for me.. Any tips/advice?