You are on your way. Pay careful attention not to slip on how you eat. I was about the same and all of a sudden I would slip on what I would eat and gain a few pounds here and there. I was about the same at 18 maybe a few lbs difference. Now I am 25 and over 200 lbs. Watch what you eat and get on a regular exercise regimen. The sooner you start a regular exercise program, the easier it is to maintain.