exercise at least 5 times a week

hmmm..this is turning out to much more tougher than i had expected it to be! I have come to a few realizations though..firstly ..the reason should be right..I wanted to exercise only to lose weight..and when that did not happen ..well..guess what..I put on more weight!! ..now I know I might be starting to sound like I’m more than just normally weight conscious :)) But thats not the case..its just that I have this big function coming up and I wanna look really good for it..it means sooo much to me!! ..and I had my exams a few days back..and they just disrupt my whole routine..I start living on chocolates alone and start feeling really bad bout it..so second thing..I want to stick to this goal for a better reason..I really wanna build my stamina..AND feel good bout it..and the rest will be fine..atleast I hope so..oh God,a li’l bit of help wouldn’t be entirely unwelcome here! :)