How can I tell if I am addicted to cocaine?

Okay so I have ADD, Attention Deficite Disorder not ADHD, and I take ritalin. I was reading about it online the other day and I found out that it has cocaine in it, something I was not informed of. I'm not cool with that since I take it EVERY DAY. I was also reading that because of this I could potentially become addicted to cocaine. Since I've never done it before, or ever met someone who has, I wouldn't know whether I'm addicted or not. How can I tell? I'm asking cause I'm 15 and would rather NOT become an adict to anything. I would appreciate any help( : Thanks!( :