M'kay. So, confusing :]?

I happen to be in love with this girl I've known a while now and she is the first girl I've felt so strongly for yet even though I've gone through extremely..difficult things just to make her happy such as heartache because she's rather inconsiderate when it comes to how I feel, even telling my mom how I feel for her, and admitting I think I might be because of her and getting chewed out by my mother, and simply just emotional abuse because she's so cold and closed in that it's rare that we ever share affection. She doesn't believe me when I say I love her although if I didn't, why in the hell would I stick around for such bullshit? I'd do just about anything to make her happy, I'd give her anything she needed to feel satisfied and all I want to do is love her, I've been trying so unbelievably hard yet she just keeps shooting me down. Do I stay, or walk away and try my best to forget?