damn. I'm INTP on the real (but still rather insipid) meyers briggs. I unfortunately share all of your traits. You'll find out some things real quick in college which I am sure you already started to learn in high school. You are a loner by nature and could care less what grades you get. It's not important what they think you get out of it, it's what you think you get out of a class. I spent 6 years in undergraduate study... (the standard is 4 for anyone not familiar) I bounced from major to major and took more classes than you could believe. When I graduated, I had transferred once, gone to 3 summer sessions for intensive courses, and ended up graduating from one of the biggest universities in the USA with the most credits ever accumulated by an undergrad at their university. I walked away with 2 degrees (I had enough credits to give me a second one so why not.) The majors I finished were history and philosophy. Once again, these were not my only majors I was going for. Merely the ones I finished first. I figured I needed to get out of undergrad soon and go to grad school (in something). What am I doing now recently out of college? applying for grad school. Going either into PhD neuroscience or MD neurosurgery. I should also point out I am currently working crappy jobs until I get into grad school because no company will hire someone who is more qualified than 99.9% of their managers. If seeking employment stay away from larger corp.s, they see intelligence as the ablility of a worker to be able to escape after the company 'invests so much training' in you.
You will find that such things like the MCAT,GRE and (for you) SATs were/are easy. It is good that you'll do well on standardized tests because your grades will likely suck because like me you will flit around to courses and subjects you are not in the least good at but which are so damned interesting. (I took ancient latin and sanscrit as classes while trying to do a physics major which still technically remains only about half done, same as math and comp sci.)
Advice if I had to do it over? Not sure. I am not one to be able togive good advice considering my track record. Definitely go to college and finish it. Be prepared to be confronted with the most amazing stupidity on the part of administation. (DO NOT try to change this at your school... that is a mistake I made.) I see too many people with potential and the 'spark' of innovation who fuck up by not finishing college. I would say narrow down your field as best as possible and limit what you take as classes. Don't go too far afield. I never meant to get a history or philosphy degree. I finished the majors by accident by taking interesting classes and decided to stop and go on to other things. You won't find too many people that are like you, slashdot is a nice collection where you might meet some, but in the real world we are few and far between.
On a random note, take as many random phys ed classes as possible. I have more hobbies than is healthy and many things (scuba, kayaking, windsurfing, racquetball, whitewater rafting, fencing, etc etc etc) are all because I decided to go out and try esoteric things which I might not have found elsewhere. Generally if you don't do this stuff in college where others want to also, and it is cheap to do them (and it is) then you might miss out completely on them.