If your a girl and have a best female friend and get jealous of her crushes, how can u tell if u like her ?

I mean, bc I always get jealous when she talks about him...I'm not sure if I like her romantically or what...but I think I do...I mean I get really embarred when were dared to kiss or something and everyone always says awww ud make a cute couple...I think I like her but idk I'm not sure...I've never liked a girl before I always thought I was straight...what do I do...