I think that's probably something you should keep in contact with your school counselor or social worker for. Keep them informed of how you're feeling and obviously keep track of your grades so that you can prove you're doing well academically.
My son is receiving extra help from the school due to social issues he's been having. I think he's slightly OCD although, he hasn't been diagnosed. He has been diagnosed with depression by a psychiatrist and was on medication for about a year until he started refusing to take it. (He's 15) He doesn't have to do things over and over til he feels they're right, but he definitely obsesses over certain things and has obsessive thoughts.
Anyway, my son feels the same way you do. He doesn't want the extra help and wants to just do it all on his own because he is capable of getting the good grades. At this point, I'm not sure he can refuse the exta help unless I, his mother, tell the school we're done with it. Honestly, I don't even know if that would work. Once the school feels you need the help, they stick with it because it's their responsibility to make sure the kids with issues make it through. They don't want to be put in a situation that might get them accused of neglecting their duties as educators, etcetera (my guess).
Again, keep in touch with your counselor and social worker at school so they can assess your progress. Maybe it's possible you don't actually need any help anymore and as professionals, they should notice that.