Thanks everyone. Turns out she thinks we're moving too fast mentally, she says she doesn't want a huge commitment cause she's still so young, we're opposites on many things but we sing the same song at a different tune...
We're in the last year of highschool, our relationship is going well, on the physical level we're really comfortable with each other, and mentally we are as well, but I think she felt i was commited to marrying her and having kids with her and I think she thinks that because we had discussions about that...
I did demand for explanation and she gave me one, it hurt, but I know it's only logical not to commit at such a young age, no we're good again =)