You picked the PERFECT time to nip this in the bud! I'm 19 and just finished my freshmen year of college, and I have been overweight for most of my life too, except when I was a very young child. BUT.... I was OVERWEIGHT... it was when I went away to college that things spiraled out of control and I was eating nothing but terrible food and too much of it... and as a result, gained 35 pounds in just a few months and became (just barley) obese. College can be an easy time to put on a lot... you have an all-you-can-eat cafeteria, no parents to tell you not to eat anything... if you don't already have good eating habits instilled in you, it can spiral out of control... and FAST. If I hadn't woken up, I might be 30 pounds heavier by now. By tackling this during high school you are making one of the best decisions of your life! Trust me!!!!!!!!!!!!!! Good luck on your journey. I'm sure you'll love it here. There is wonderful support and supportive members that give simply fantastic advice.