Once upon a time I thought I might want to be a psychologist -- the idea of helping people with behavior and mental processes was appealing.
That does sound very interesting - what about it interested you the most - any certain mental health issue?
Probably witnessing people who could be their own worst enemy, you know? Where their ability to enjoy life and create a balance between its demands and pleasures were challenged.
Does a psychologist also deal with illnesses like bi-polar?
Absolutely. Of course it depends on the psychologist, and what they may specialize in. The APA requires that applied psychologists be both researchers and practitioners, and that they possess advanced degrees.
Are they then able to prescribe medications as well?  I was always confused between a psychologist and a psychiatrist.
Psychiatrist! And same! So while a psychologist can work with someone in a therapeutic way, they'd need to refer to a psychiatrist to prescribe any medication.