Well, you're a year older than I am, but I usually take this appraoch:
Last year on my birthday, I weighed 285, and that was the last time my best guy-friend saw me. *The guy whom I've had a crush on for 3 years now* While I'm working out, I think of how far I've come already. I'm down 50 pounds just since the last time he saw me, and I want to see how much I can lose before I see him again, to surprise him I guess. I do send him progress pics of me and the last one I sent, about 2 weeks ago, he was freaked out by how much thinner I looked, even though I can tell no difference between what I look like now and back 8 months ago.
Also, because I graduated high school 5 years ago this coming May of next year, that puts me at the halfway point to the 10 year reunion and I want to kinda pay back all those people in high school that made fun of me. I saw my best friend of 12 years last Sunday. That was the first time I'd seen her in 3 years because she had moved away to Missouri, but she said I'm going to lose all the weight and then at the reunion everybody will be wondering who I am because I'll look so different and all the guys that wouldn't give me the time of day in high school will all of a sudden be wanting to talk to me. *too bad is all I can say*
I also buy different health/exercise/diet magazines with tips in them and new exercises and stuff to try. Sometimes that keeps me motivated too. Like last night I did a 10 minute ab workout that I got out of the new Diet & Exercise magazine and all I can say is that it definitely works because my ribs are saying, "Where'd that come from?!"
You just kinda have to find your own motivation I guess, that's what I do. I watch WWE wrestling too and some of those people I look up to for motivation. Speaking of, I have a Trish Stratus, Nidia, and Brock Lesnar poster on the door of my closet that I have to pass by every time I go in my room and just seeing the way they look makes me want to try to stay on this routine of diet/exercise. Brock works out everyday, Trish works out everyday, I dunno about Nidia, but I know there were rumors going around that the executive people were telling her she needed to lose weight, and she's soooo not even fat.
But anyway, hope this helped, and good luck!