Christina, welcome to FitDay and the forums!
Congrats on deciding to kick the soda habit--that's a great start. As far as other family members not being supportive, well, that's often par for the course. In the end, the decision to get fit is a personal one, and one that we sometimes have to take alone. If you find yourself needing support, this is the place--don't be a stranger.
47 M 5'8"
May 4, 2010...... 440? lbs. (Start FitDay Size 60 Jeans)
June 19, 2010.... 393 lbs. (First Weigh-in)
June 19, 2011.... 229 lbs. (164 lbs. gone in one year :-)
Current Weight... 185 lbs. (Size 36 Jeans)
Next Goal 169 lbs. (07/04/12)
Ultimate Goal 165 lbs. (12/31/12)
The best exercises for weight loss are Fork Putdowns and Table Pushaways.