OMG I really need some advice I'm having some sort of crisis!!!!! What should I do after High School?

Okay first off I just turned 18 and am about to graduate High School in June and I don't know what I'm going to do after high school. I am a pretty intelligent person however my grades do not reflect that. I am unsure about where I want to go to college and what exactly to major in and I'm scared that I won't be happy where I go because I have a tendency to be indecisive if something does not feel right the second I have it. I am in the or just outside the top 25 % in my cl of about 500 and my G.P.A. is about 80-85 and I have always been in honors cles. I just don't know what to do? I do have a knack for business and I would like to get my real estate agent license as well and possibly do something with that. Plus there are material things I want(like a really nice car) and places(other countries) I want to go to and I just really need some perspective on things so any advice would be greatly appreciated. Thanks in advance.