Is it normal we're like this?

I'm a girl. And I've known this girl since 7th grade, we're now seniors. I'm bi, but she's straight. We had a sleepover in 8th grade (we'd usually sleep seperate, her on the floor and i on her bed or vice versa) but that time we slept on the same bed and started making out. We would make out when we'd sleep over since then although she still claimed to be straight. Sophomore-Jr year we kinda lost touch, when we'd hang out however we would never get too close to each other. or when we'd have to be close we would never touch. Sr. year a couple weeks ago, we had a sleep over. we drank. went to bed. talked about things we wondered about each other but we never asked. and again she claimed to be straight although we ended up kicking it again. We would never date. We're not that attracted to each other, when we hang out we still keep a distance, no affection or anything, no physical contact at all. but wen we sleep over, there's always a chance we would kick it again. Is this normal? It really drives me insane thinking about it.