Hate to be a pessimistic realist here, but I'm guessing that less than 1% of the people that want to be actors or professional sports athletes actually make it. If you have some sort of natural talent and have been noticed for it, then go for it; but if you're just a regular Joe Schmoe like the rest of us, then go to school and make a career out of it afterwards. I would pick a job that pays well and go to school for that.
And as far as following your dream and "doing what you love,"... well, I say that should include getting paid well for it or you'll be struggling financially afterwards. I know people who really liked history, so they got a history major, or people who like anthropology, so they got an anthropology degree. Their job now in real life has nothing to do with anything they went to school for. In my mind, that was a waste of 4 years and all the money the tuition cost them.
School/College should be a place where you learn skills that you will use in real life after you graduate, not some place you go to for 4-5 years to take classes in something that is interesting but has no real life modern practical application. It's too expensive for that. Save those sort of classes for a community college. By year 3, you should have taken enough classes to see what sort of field you like. I switched my major 3X by my junior year, but it was always to something more focused that I seemed to gravitate towards.
You've got to be good at something, whether it's computers, cooking, art, science/math, fixing cars, debating/arguing, taking pictures, etc. The answer may not necessarily be college, but some sort of trade school, which can also provide a very comfortable standard of living.
Like others have said, if you want to pursue Hollywood, do it in your spare time while you are studying for what you will most likely end up doing after you graduate.
You may also be able to talk to a college counselor to discuss some of your options through (for free).
What the hell, man? 
