Hi there! well, I think you've made a great decision, especially at (don't take offense, please) your young age. It is SMART to think get in the habit of regular exercise now! I only wish I had started years ago.
It doesn't take much, only consistency, to get in the habit, and you will see results. Exercise will strenghten you, both body and mind, and make you look great! (more importantly for yourself, but heck, you can impress those college boys, right? (wink)
What do you think you would like to do? There are so many choices. Step aerobics, dance, yoga, Pilates, and add some hand-held weights for strength...this probably sounds like alot to throw at you all at once. Read around this site, there are stickies that have lots of good info.
It would be great if you could get yourself committed to this now, 'cause then you have the facilities at school to use in a few weeks.
The summer heat CAN be a deterrent. Do you have a place indoors, air-conditioned, with a VCR? If so, you're set! There are so many videos to chose from. I recommend
www.collagevideo.com. The videos are separated into categories; you chose what type of exercise you're looking for; the videos are actually done by the staff and then rated.
and if you don't have airconditioning, I have taken a cool shower WITH my exercise clothes on, jumped out, then turned on a fan full-blast, then done my tape...kind of extreme, but it works
Best of luck in whatever you chose!
Summer excuses!
I need to excercise, and I find all the excuses not to, believe me. Anyway, the number one excuse is the darn Texas heat. The only excercise I really enjoy is walking, but it is just too hot. 
Hopefully it *will* be easier there (thank goodness they have required PE - am hoping that will be more fun than high school!) but I feel like I should still start NOW. (Besides, I want to look good for them college guys. And.. err... not have to buy a new wardrobe!)
