Your getting good advice here and you should do everything the smart people are telling you to do.
Having said that, I'll depart the norm and offer the free advice of go to school, have fun, try at school...but not too hard. Don't get in trouble with the law is the best piece of advice I've read so far. I'll offer one more piece of advice: don't get hurt skiing in Colorado or doing something else...NPQ is real.
Also you don't need to be a genius to fly. The aviation industry is going to hire about 10,000 pilots in the next 10 years and they're going to get a lot of them from the military. As such, the bar for being accepted into OCS and the flight program is raised or lowered opposite of the demand for civilian pilots, I.E. high demand for airline pilots = low bar for admission military flight training.
I joined up in 99 and the airlines were booming...even Helo pilots who did IP tours ina T-34 were getting hired by Delta and EVERYONE was getting out. I graduated in the lower half of the upper half of my high school class. I was an All State track runner in High School, ran track in college, and that actually helped in OCS (I was about to fail my second MTT, but I was 1 of only 5 people who could max out the PRT and of all things our class was struggling with for Honor Class it was PT so my Gunny stepped in and saved my ass from getting rolled). My grades in college were weak. 2.87 cumulative, but I was a Math major (3.1 in my math classes) which helped with the weak GPA I incurred as a physics major because...well...that shit is hard. My tests scores for both the Air Force and Navy were outstanding. The Air Force didn't take me, the Navy did. The best piece of advice I got through the whole process was from my recruiter and right before I took the personality assessment: "Almost everyone who washes out of aviation recruitment does so because they fail the personality test...they're not looking for saints." I also got my Private before joining and I think it looked good on the application at that time, not so sure now. All it did was get me accelerated through FAM's/Contacts which actually hurt me more than helped me. The guys who had their instrument ratings were the guys making money on prior flight experience.
You're young so you won't get this, but "There's a difference between knowing the path and walking the path." AND there are many paths to your destination...
Final thought: An OCS buddy of mine was Georgia guy who went to Colorado for 3 years after he graduated from college and did nothing but smoke dope (I mean a lot of dope), work construction, and ski before he joined the Navy. I worked in sales for a couple years before joining. He and I also went through flight school together. He had slightly better grades than I did, and got Jets while I got Helos. I sometimes wonder if I had smoked dope in college would I have gotten jets? Don't test that theory.