My Mom Lowers My Self Esteem When Wanting To Loose Weight ):?

idk what to do. ive been eating healthier.. i usually eat a wrap at school nd soup when i get home and then i dance everyother day at home, like zumba and then the other days i have step team after school. And I felt So Confident & Stuff Nd All My Mom Does Is Yell At Me & Call Me Fat And Tells Me To Go Do Hard Core Excersize To Loose All My Fat Nd That She Knows I Dont Really Do Exersize Nd Its Juss So Painfull To The point That Everytime She Brings Up My Diet I Cry Because I Know Its Always Something Bad That She Has To Say . Please Help Me. What Can I Do & What Kinds Of Exersize Can I DO lIke In MY Room And WHat Kinds Of Things Should I Eat? Its Getting To The Point Where I Cry Almost Everyday & I Really Am Trying But She Just Lowers My Confidence In Loosing Weight. .