I'm studying for my Bachelor's in Psychology right now. This is what I was taught in my Careers in Psych class: (In the state of Missouri in the USA)

IF YOU WANT TO BE A COUNSELOR/THERAPIST:

-And you receive your masters in social work or counseling, you DO NOT need to be supervised once you're through with school and have passed the exams.

-And you recieve your masters in psychology then you WILL need to be supervised to have patients.

Getting a master's degree in psychology is really for people who either want to do research OR who get it on the way to their doctorate. If you're not interested in doing research or you want to be a therapist without getting your doctorate, then social work or counseling is the way to go.