Unfortunately no one can motivate you, but you. Or fortunately depending on how you look at it. It's something very vital and to leave it in the hands of someone else is too risky.
But then there's something else we always say around here. One shouldn't rely on motivation. It's fleeting and is never around when the fried foods and sweets are. It's also not around when exercise is needed and the couch and the TV are calling out. Or when you're tired. Or stressed. Or anything. That's when we turn to commitment. It's much more lasting. Once you make that ironclad commitment to do this - no matter what - then it gets done. So I urge you to commit to do this. Whether you feel like it or not. Whether it's convenient or not. COMMIT to it and then there's no way that it can't not happen. Make it a tippy top priority. Pencil it into your day, like any other vital appointment.
But I do agree with Onederchic. When I first started out, I walked. 15 minutes 2 X a day, since going any longer was too much for me, I broke it down to 2 times. I increased slowly. Then I discovered those Leslie Sansone DVD's - they're FABULOUS. I also got myself a resistance band. Great at-home, inexpensive strength training.
Make that commitment to yourself and your good health, and then there will be no excuses tolerated.
Congratulations on your weight loss thus far and I look forward to hearing of your continued success.