GenGen*

Ahh...I've been in a similar situation in reference to low self esteem and all.
Look, just because your mom or relatives are obese, doesn't make it definite that you will always be, though as you see, it highly influences you.
Stop trying to lose weight and focus on eating healthy. BE healthy. Eat fruit, vegetables, drink more water, eat grains, eggs, protein...exercise.
One step at a time. I got my family to get used to wheat bread. I usually get the low-fat or fat-free milk if I'm eating cereal. I always eat breakfast. I eat little snacks every few hours. My problem is my water intake, and I'm not always motivated, but hey.
Remember one goal: to feel better, confident, and happy with yourself. If you've got a friend, anyone, ask for support. Lift your chin up because you haven't much time to lose. As for low self esteem, write a list of what you don't like about yourself and why. then see if you can fix it, or if you just need to accept it. I'm VERY sensitive and emotional. I can control my reactions to others, especially the ones i care about, but i have to accept my sensitive side.