OCD is when you have funny thoughts like if you're religious you think that you're going to hell because you touched your GFs boobs. Then you start doing things like washing because for some weird reason you think that will keep you from going to hell. Or you think that you ran someone over and you drive back the way you came many times to check you didn't do it. That's OCD if you don't have funny thoughts like that, that keep you from living life then you don't have OCD. By Obsessions they mean in your head, like you worry about the same thing over and over. Not about playing videogames, that's something else. Then you do compulsions, washing hands, counting, rituals to keep your mind busy from obsessions.