I am falling in love with my best friend, what should i do?

I am 18 years old and my best friend (who is a girl) came with me to a wedding in my immediate family yesterday. We had a great time and went back to my house afterwards. She has never been very intimate with me but she wanted me to lay down with her etc. I didn't kiss her because I didn't want to ruin what we had if she didn't feel the same way. But I think I am falling for her. She just left for school today and I won't see her for a month. She told me she wants me to visit her in school. I don't know what to do, I feel like I am romanticizing this a little bit and I don't want to make an *** of myself and tell her due to the fact that she is the only true friend I have and I can't ruin that. I don't want to regret this, should I wait a month to see her or what? Advice please...I feel like I need to go visit her at school before I go back to my school. I feel like it would sweep her off her feet. But she's the type of girl that if I say this, and she doesn't feel the same way, it would most likely ruin everything and make it very awkward. I feel like I am about to act impulsively which usually screws me over in the long run, but I don't want her to find someone in the next month. I also don't want our relationship as friends to diminish because I won't see her for so long. Is it normal to feel this way?