Would you be bi-sexual if...?

Well I'm a 15 year old girl,, ive recently seem attracted to girls strangely.. Ive always wanted to know what it's like to kiss one,, ive also found out this show on YouTube I watch, that the girls are actually bi-sexual and had posted videos of them kissing (for the fans cause their pretty famous on YouTube) and I reckon it's soooo cute! so.. Am I bi?