Am I bi sexual ?help?

I am pretty sure I am bi sexual I mean I told my mom and friends that I have a crush on one of my best girlfriend , but never labeled myself as bi sexual . When I watch let's say a show like true blood where there are two girls having sex or going down on each other I get really turned on . But I get the same pleasure from guys and girls together . I have had several crushes on both girls and guys so am I bi ?