What exactly is your end goal? Do you want to be a test pilot or even be a part of the space program eventually? If not, your degree or even a PhD in Aerospace Engineering will not help you in pilot training. It will, however, help you in getting a pilot slot. From my personal experience, the really geeky smart dudes/ dudettes with a technical degree in xx engineering, physics, computer science, etc. tend to over analyze in the cockpit and tend to be the biggest hamfists. I got a degree in Aerospace Engineering to better my chances of obtaining a pilot slot and I can tell you that my degree did jack for me in UPT. Success in pilot training has to do with studying hard, chair flying, playing hard, and to a high degree, your God given eye-hand coordination. My degree did help me land some good deals in the Air Force so I didn't completely waste my time studying my a$$ off while my friends were out enjoying life!
As others have said, you need to hit the gym and get some aerobic & anaerobic excercise. Regardless of what type of aircraft you will fly, you still need to be able to handle about 6-7 g's in the T-6 unless you enjoy doing the funky chicken.