Mild case of OCD?

I have a very mild case of ocd. Mostly it has to do with repeating certain things multiple times. Like when I itch I have to itch a certain way and if I do it wrong I'll have to do it again. If I try to ignore it I get a twitchy and that is all I think about. When I was younger it was different, I would wash my hands every time I thouched something, I always would have to cover my hand while opening doors. Please help, how can I get rid of it?