What is OCD like?

I know it's not just being obsessed with cleaning, obviously. Since I was a kid, I've had little ...games?...in my mind. If I'm in a car, I blink/roll my eyes or pop my ears a consistent number of times between landmarks (telephone poles, street signs, guard rails, etc). I do think like this a lot but not necessarily daily. I've never considered talking to anyone about it because it has never hurt me, but it is weird if I were to explain it to someone or if someone catches me. What is OCD like for you or anyone you know?