If you need to trick your self into riding, maybe you should just trade it in on a big screen and a recliner.
Seriously, I don't know how to answer that. The first thing would be to enjoy it, and if that doesn't work for you, and your dis-satisfaction with your self image doesn't work for you, there isn't much I can say that will do the trick.
Try to find the fun in it, and forget about the 30 lbs. If you can do that, you will drop the weight. Buy a fat tire cruiser, and hit the beaches. I know if I was in Hawaii, I know the scenery I would be riding for.