Guys would you date her???? she has very low self confidence!!!?

You two should just start working out together. You guys are best friends, I'm sure it'd be fun and would get her in shape. Because when you're 13, almost 14, your body is still growing. It might be good for the two of you to get involved in a sport together. I think the best advice is to get your friend exercising, and to do it with her so she doesn't feel alone. Make sure she knows that boys are not EVERYTHING. I'm sure she's beautiful and she should not need a boy to feel that way.