@ Keg -
A couple:
-Relax, it's all a game. The cadre are not really angry at you, or at your flight, or really angry at all. They are playing a part (big, mean cadre) just as you are playing a part (meek, useless basic). Are you actually a worthless human being? Do you actually fail at everything? No! Of course not! Laugh it off (internally) and move on.
-Live meal to meal. After wake-up? Almost breakfast! Post beat session #1 of the day? You're almost to lunch! Etc. I'd also recommend keeping your own "calendar" (mine was scribbled on the back of some of my notes) so you can have the satisfaction of crossing the day out and saying "X days down!" each day.
-If you are remotely religious, go to chapel whenever it is offered (Should be 2x a week). You can cry and get a hug or just sit there and try not to fall asleep. I'd also recommend getting involved in SPIRE (Bible studies on Mondays) once you get to the school year--huge stress relief.
-Be a stealth cadet. Less attention = less stress. If you are a good team player, try hard, and don't give up, your cadre will notice and your life will be better.
-Take it seriously, not personally. They are NOT going to "kick you out" of basic unless you are a) seriously injured, in which case you can come back next year, b) decide to quit / have a flagrantly bad attitude, which you completely control, or c) do something that's actually illegal, which you also control.
-Don't be afraid to rely on your teammates. Unless you are secretly a superhero with superhuman intelligence, strength, and endurance (unlikely), you will not be the best at everything. Let others help you if need be, and spread the love by helping others with things you ARE good at.
-Laugh! A lot of funny things will happen. In your room at night, while you're putting things in order, go over the hilarious occurrences of the day (those you can remember.)