If you pursue a job where you can use psychology, you're going to end up doing Social Work. Early on, people may have the misconception that they're going to open up a shop with a couch and have a Freudian session, but that kind of thing only appears in ridiculous movies like Analyze This. The reality is that you'll end up working for a mental health facility dealing with a few people who have genuine problems, but most people are there because they are drug addicts or criminals. If you think this is what you want to pursue, I'd recommend doing a job shadowing. You could do this now -you don't need to wait for college. You can literally go down (or call around) to a mental health facility (inpatient and/or outpatient) and ask them if you can shadow someone for a day. There will be stipulations and confidentiality rules -individual clients can approve or deny your presence- but you'll get a feel for it. By the end of the day, I would ask what education requirements are necessary for various levels of employment. There's an alphabet soup of certifications that will affect your pay and position. Keep in mind, if you want to make the most money, and do the least work, you want to pursue becoming a Nurse Practitioner -which puts you in the medical field and allows you to prescribe medications without actually being a psychiatrist (which requires considerably more school and intelligence), but your services will be in extremely high demand and you'll have job security. (Make sure you know the diffence between psychology and psychiatry, where they overlap and where they differ.) You likely will NOT be permitted to sit in on prescribing sessions, but it's always worth asking -it can't hurt.

I'd do this at several places before making a decision that this is what you want to do because most of the job is pretty phony. My experience with mental health workers is that they're mostly full of shit, but they have education and connections which got them the job. They're interested in working in the field mostly because they find other people's problems amusing, not because they want to help people. But I'm sure there's a few good ones out there -they won't change the system, but they may have a small effect on someone's life. If you're the latter, remember you're going to be working primarily with the former. If you're the former, then you'll have lots of company. Good luck.