I think I might have OCD?

I don't want to sound like a hypochondriac, but I thought I might have OCD for a long time now, I'm currently 18, and I have a lot of the symptoms of body tics, (my parents took me to the doctor when i was younger for my tics, and they they mostly occurr when i get really stressed or anxious) compulsive rituals i do to satisfy myself, putting things in certian orders, paranoia about sitting on certian things or touching certian things because they make me uncomfortable, invasive mental thoughts, hoarding of objects because i feel Im going to need them at some point, mild paranoia (feeling of being watched), constant and excessive checking of things like water faucets, forms, writing, as if i dont know whether to trust what my eyes are telling me or something, its hard to explain. But anyway, i am going to talk with a doctor, i just wanted some input from people who might have had this disorder. The big question i had was, I dont do these things all the time. Like it seems to turn on and off with different things. For example i dont put everything in order all the time (my room is a mess) but when i feel the need to put something in order its like i have to do, i just have to, or I don't check the stove constantly because i dont feel i have to, just the one faucet closest to me. So do OCD people carry through with each symptom so it effects everything around them, or might they just do it with certian things at certian times?