I have to agree with Jenny that losing weight probably isn't going to instantly make you popular, give you more attention, have people jumping all around you telling you have beautiful you look.
I lost 40 pounds since June 08. I did it because I was tired of being overweight and I wanted to show people that I could be skinny. Well I did, but as I got closer I started caring more about what I thought then what others thought. I thought more about being healthy and how I felt then what others would think when I went back to school 20 pounds lighter. I'm skinny, I go to school, my compliments come from friends and maybe two from other people? Nobody pays anymore attention to me then they used to, and I'm not anymore popular than I was.
BUT, anyways. lol.
Think of it more as a lifestyle change. If you diet and then you stop dieting you'll gain it back. I find the best place to start is giving up soda. I found it was the easiest thing to do, my grandma just recently started giving up her diet soda and said she hasn't had a headache or backache after about a week of being without it.
Exercise will help you be healthier, I'll admit that I probably couldn't have lost weight without exercise because what I was eating was lenient and I didn't care for good foods. It makes you stronger and now I love to exercise, when I used to be the last picked in gym class. It lets me take stress out as well.
The eating is the hardest for me, I won't eat something healthy if I don't like the taste. I love broccoli, but I hate bananas. Therefore I don't eat bananas but I need to find something to replace those nutrients. You also need to try new things. I learned to LOVE oatmeal. It's super delicious to me now. At first I didn't care for it, but then I started eating it more often and now I've learned to love it. I'm definately not a expert on eating, it's still something I'm working on.
Losing weight made me be healthier and being healthy made me happier. Exercise and knowing that I have determination and willpower made me more confident. Of course looking good made me a little more confident.
It lets me do more things that I want, but it didn't make me more noticed.