It was hard for me to tell mine. I read in a magazine about a girl that had OCD and i could relate to the things she done. That made me feel that i'm not right.
I was thinking of telling my mum but i could not. I was too embaressed. But i started crying eventually, then i told my mum everything and i felt better after that.
I thought i was just a normal person. I've had OCD since i was 3 and now i'm 14. I don't know life any different. I would tell your parents, it's not so bad after, you actually feel better.