Flirting

I like this girl and I thought she liked me but I'm not too sure...HELP ME!!!

Right so basically me and this girl who I didn't really hang around with were in a show together and we got on okay during it, I only started to really like her after the show but by then it was holidays and we couldn't talk. I finally messaged her on Facebook but knew that I would have to talk to her in person eventually so I didn't bite off more than I could chew. School started and we didn't talk too much, she was with her friends, I was with mine, but I got on with it. I noticed her occasionally looking at me but less and less now. Today I approached her and tried to have a conversation but it seemed a bit lifeless and awkward and we both know there's this experience between us but I don't know how to carry out this situation. My question is what should I do in this situation because I don't want to freak her out and tell her all my feelings or start overwhelming her by talking all day to her seeing as we're still only acquaintances, but I don't want to lose the fragment of a friendship I have with her by ignoring her. It's difficult to talk the right amount to her and make sure I don't make a fool of myself. Please give me good advice, the show was a month ago and I haven't stopping thinking about her since... :(
I like this girl and I thought she liked me but I'm not too sure...HELP ME!!!
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