Psychiatrists....?

I literally panic when someone touches me. I've never been d, but I've been hit and stuff. I find romantic stuff generally repulsive and at times insincere. And even if my dad huggs me, I get grossed out. How do I stop this? Even if I really like someone, I'll still flip out when they touch me. And I'll retailiate in ways that are just mean, like hitting, screaming or running away. And once that happens, I'll feel grossed out and nervous for a long time. What causes this fear? And how do I overcome it? Note: I have NEVER found anyone attractive enough to touch me in my whole life. Why? Please help :D