Hi Jodie - I think it's worth a visit to a doctor, but if you don't want to worry about self-diagnosing, then I would just explain the behaviors and thoughts that are bothering you, and let the doctor make the diagnosis.

Maybe be prepared with some examples of how you are 'loud and annoying' and what you mean when you say that you can't help it.

Not sure where you live, but in many cities, there are subsidized mental health clinics that you can go to for free or cheap. They'll interview you and if appropriate, direct you to a psychiatrist or psychiatric nurse for further evaluation and treatment recommendations.

Good luck!