Very few people know what career they want when they're seventeen. Of those people, a significant proportion end up either doing a different job or displeased by their choice.

This is what I did; it may or may not work for you. Go to a college with a wide variety of class choices and highlight everything in the course book that looks interesting and that you have the prereqs for. Narrow it down to four or five classes by eliminating courses that occur in the same time block as another course you're more interested in, courses with dull or unintelligent teachers, or courses that come from disciplines you've already taken a lot of classes in. (Note: if you have general course requirements, take those courses.) That should give you some data to eliminate majors you're absolutely not interested in; for the rest, assuming you have not gotten an all-consuming obsession with one particular field, look at the BLS statistics to see which one has the best overall job outcomes (income, hours worked, unemployment risk, etc) and major in that one.

General warnings: unlike most people here, I am not a STEM major; my experience applies strictly to the social sciences and the humanities. I also have not attempted to get a job in this economy, so take my advice with a grain of salt.