Does your high school have counselors? If so, they probably will be a great help. Even if they don't give you a lot of good advice, they generally have resources at their disposal that will help you research your next step. I'd also start touring colleges/working through applications. The process itself, even if you decide not to go immediately, will answer a lot of questions for you and help put your mind at ease about your decisions. For example, private Fancy Pants U may offer you a full ride; take that, free education is awesome. Or you may find you need more time to decide; lots of colleges let you take a year after accepting to actually enroll.
As far as money is concerned with college, it's about keeping your costs as low as possible while obtaining a degree that will help you get a job that makes you feel fulfilled/at least not hate life. This is done through careful planning and a eye towards balance. Private schools are more expensive, but tend to have better aid packages and alumni networking. Community colleges are cheaper, great for getting technical degrees or burning through core classes (you still get to say you graduated from Fancy Pants U even if you took half your credits at Cheap'N Stuff). Public can be a great choice, especially if in-state, and some can give the private schools a run for their money on the prestige thing, just depends. Take your time and do your research.
My particular path served me well:
1) 2 years of community college; I took classes that looked interesting and met the requirements for transfer degree, meaning that any school within that system had to accept the credits. These classes are cheaper, so lower risk if you try something and figure out it's not for you. --> I took these my jr/sr year of high school through a state program, so they were free. Is this an option for you?
2) 2.5 years to finish up my 4 year at a public college; by the time I had finished my transfer degree, I had pretty well figured out what I wanted to pursue and was able to make it a double major without too much of a detour. I also worked 30 hours a week to help defray costs, and interned wherever I could to test out jobs/build a resume. The interning part was key to finding jobs post graduation/being more confident in career paths. --> Liberals arts degree and I make 6 figures now. Don't be afraid to take what interests you, but always have an eye towards your next step. $200,000 for a 4 year is pretty much never a good idea.
3) 3 years to MBA; not gonna lie, I'm not sure if this was the right path yet. It led to higher paying jobs, but was stressful to work full time while pursuing it and I think I may have gotten it too young. I was already making good money, but was insecure about 'only' having a liberal arts degree.
Good news though. You've got plenty of time to plan. Take a breath and enjoy your senior year.