I had the same problem. Like many girls said, I wasn't teased or anything to that extent, but growing up in elementary/middle school/high school, I was skinny. The whole thing about "Black women should have a big booty and be curvy" is foolish! There are different types of bodies in every race, you just gotta learn how to own it gurl!
I am now 20, and although I am still on the skinny side, I have grown. I think it's because I hit puberty, and now I look fine. You just have to wait. AND PLEASE STOP EATING LARD!
You're gonna have a heart attack
There are more healthier ways to gain weight. Trust me.
With that being said, your parents are scum. Even after you were put on suicide watch, they still snuck in comments about your weight?! Jeezus. Focus on your grades, and start hanging out with more positive people. And BHM is here for you, dear