am I bisexual?

I've only dated boys- I'm 16 and I've been dating my current boyfriend for 7 months. Almost a year ago I made out with a girl and have been thinking about it ever since it happened. I loved making out with her it felt so normal- as if it was nothing out of the ordinary. I have fantasized about doing more with a girl and I could possibly see myself having a relationship with a girl too, however, I have never had evident romantic feelings for one.