Do I have OCD?

Well I am only 14, nearly 15, and I have had this since maybe 13 or so and well this usually only happens at night or when I am not thinking about it. At school, I very rarely do any of the things I will say and so thats why I am not sure if its OCD. When I go to sleep I have to like check if all the plugs are unplugged and if everything is in a certain way, like placed in a proper way. I also have a thing where I count in my head and stuff. Sometimes I lose interest in an obession I have and so I can try cut it out but nearly always a new thing turns up. It seems like it is and I am really scared and sad that it could be. Could anyone tell me if it is and ways of trying to stop it or lower it down to a minimum.