Do I have OCD? Obsessive compulsive disorder?

I think there are reasons why I have OCD. One being that I can't step on sidewalk cracks and I have to walk 2 times b4 i go into the next crack. Anoher reason is that I just get the random urge to subscribe people on youtube idk why. And I have little obsessions all thru out the day including doing everything an even amount of times. And it has to be an even number that when you minus the number again can be an even number twice? I think I have OCD does it sound like OCD to you? Thanks!!