What does this mean?

Ok, me and my friend have been gettin really close recently. It started with just holding hands and holdin each other etc but over the last few days this has moved on to us kissing a lot. Problem is we're both girls. I'm not sure if i'm attracted to her or not and she makes herself out to be so against ity even when we are together. We havent spoken about it and she is just acting completely normal around me. We're both 20. Serious answers please, what do you think is going on?