I'm starting to feel like a douche always chiming in with example from my own relationship so if it ever becomes overbearing let me know...
With that said, I thought you might want to know that when I first started seeing my girlfriend I thought she wasn't into me as well. I stopped calling/texting/talking to her because I figured I would just leave her alone since I assumed she didn't like me. After a few weeks, maybe 4 or 5, I was lucky enough to have a friend who spoke to her and told me she was upset I hadn't been calling her.
When I did speak to her, I told her why I hadn't called her, and she said I was stupid because she obviously did like me and she thought she had made that pretty clear. Six years later, we still laugh about it sometimes. My point is girls can be hard to read. Try not to get too discouraged.