If you aren't depressed, then I would be very surprised! Who wouldn't be with the way you have been treated?
You will have some time after you get to school to make decisions about a major, at least for most majors. I suggest you take an intro psychology class to get a better idea. Please keep in mind that a psychology major isn't a good one to get jobs. People need to get at least a Master's degree in psychology.
Maybe you can have two majors---one in keeping with what your parents want and then another one, such as psychology. I think two majors is a wise way to go anyway. I had two of them--psychology and English, and I have used both of them. But I did get a Ph.D. in psychology.
To get a better idea of whether you have depression, then you can go to the Depression forum here and read up on it. In the stickies you can even find a check-up quiz to take to see if you are having symptoms associated with depression.
Is there a school counselor you can talk to? That wouldn't have any stigma, since you could say you went to talk about your college plans.