You could try keeping away from that guy in the mall. He's bad for your diet. >:-/
View yourself completely nake in a full length mirror. Motivation.
Trying to dress "sexy" usually comes off as cheap.
Be yourself!
Tight pants might just make you look tacky or cheap. Sexy is really in the eyes of the beholder. The right person for you will find you attractive if you're just yourself without trying too hard to be sexy.