I will offer a few pieces of advice culled from the cold steel of experience: you are embarking on a long, painful, often heart-breaking journey. I know you are now in the throes of new love, but that will turn to old love soon enough - new love can make you do some very stupid, very rash things.
I agree. I had an experience of a girl telling me again and again she wasn't sure. I persevered and she began to come round (I thought), only to continually blow hot and cold, announcing I was dumped a few weeks before I was due to arrive in Poland, then ringing me a couple of days later to say she was wrong (actually, it turned out the guy she'd dumped me for wasn't interested) and then dumping me at the airport when I arrived.
I still stayed with her at her flat for a few days. A month later she was back again and I was stupid enough to go for it (love really does screw with your judgement). Then she later decided we were "not going to be lovers"... probably because she'd been getting it pretty regularly from someone else for the month or two I was in UK. (She's now married to him with a couple of kids).
Seems she was only interested when there was nobody else to pay her attention.
Now, of course, this girl might not be like that at all... BUT if she is saying this then maybe she's been burned before or simply doesn't believe it'll work. She might also get repeatedly cold feet and you are left bitter and frustrated.