When I was getting ready to head off to college I expressed very similar concerns to my therapist. What he told me was very reassuring. He said that therapist and doctors are people too. We all have problems. Heart doctors still practice if they have heart disease. Doctors can have diabetes and still practice too. In fact, he told me that he himself had been in therapy for nearly 20 years. He explained to me that the mental health field would be more difficult for me, that I would have to develop new kinds of coping skills and be really good at them, but it was always possible to be successful and he would be there for me for as long as I needed him.

What I would reccomend (as I am a person in your situation too) is express to your doctor (or find one if you need to) your goals and aspirations and have them help you meet them.

Anything is possible... especially if you're crazy.