Welcome to SparkPeople!
Motivation can be hard to find...I've found that it changes for me...when I was 183 pounds, I was motivated to get into the 170s...that was motivation enough for me. Now, I'm motivated because I'm close to my goal weight, so that alone excites me and wants me to get up and exercise!
When I was more in the middle of my weight loss, and the beginning, I was motivated by rewards I set for myself-- new songs on iTunes, a fitness magazine subscription, new workout gear, etc. The big motivating factor for me was when my family announced a trip to Hawaii 2 years in advance...so I started losing weight 13 months before the trip, because I wanted to look good in pics in Hawaii. So maybe finding a low-term goal (graduation, a friend's wedding, a reunion, vacation, next spring break, a holiday) can motivate you too. There are lots of ways people stay motivated, you just have to take the time to find out what will work for you, where you're at currently. You may try some pretty crazy stuff, but eventually you'll find something that works for you long-term! (I used to put pictures of Jillian Michaels inside my kitchen cabinet doors...that didn't work! haha) Good luck & have fun exploring what SP has to offer!