I feel horrible..

I never ever wanted this to happen. I feel like I'm too much for her and that's the last thing I wanted to do. I'm starting to think that maybe I am too old for her and because of this it's not going to work. I love her to death, but I don't want to do this to her or myself anymore. I actually do kind of want to break up with her. I hate admitting to that and it would totally kill me, but maybe it's for the best... I'm never more happy than when we're together. But maybe she doesn't feel the same. Sometimes I feel like she doesn't care. This relationship is very one-sided. I have to cater to her constantly. She's the one that I have to be understanding to. I'm really sick of all of this. I've never been in a serious relationship before and this is all new to me. I know what I want and I know what I want to do but are those wants realistic? And is what I want to do the right thing? I want this relationship to work, I really do... but only if she does. I don't want to be in a relationship with someone if that someone doesn't want to be in one... I want to know what she's thinking and feeling even if it means that it'll hurt me. I'd much rather know than not know. Sometimes I think about what it would be like without her and I hate the way it looks... but maybe it would be better for the both of us. Leaving her is the very last thing I want to do, but maybe I should...