Ask your mom to give you a list of her expectations and sit down with her and see if you can come to some agreement to either raise your performance level, with her help, or to lower her expectations to something more realistic. Working together on this may help you both and draw you closer together. :)
No, it doesn't mean she hates you. It means she thinks you have a lot of potential you are not living up to. It means that she wants better things for you than she sees now. She may or not may not be justified in her beliefs, and I know it hurts that she doesn't just accept you the way you are. But it certainly does not mean she doesn't love you.
I'm sure she doesn't hate you! Maybe she wants you to get better grades, listen to her more or something along those lines. You didnt' say how old you were. Sometimes teenagers have raging hormones and think they are already grown.(I have two granddaughters, ages 12 and 13.) Not saying that would be you--maybe you can ask her what you could do differently to meet her expectations?