How do I know if I'm definitely bisexual or gay?

Ever since I was young I've been attracted to females. I remember back when I was 5 I would watch Sleeping Beauty and Cinderella 'cause I thought Princess Aurora and Cinderella were the hottest bitches on the planet. I've also had really intense feelings for other girls my age and have thought about women my entire life in which case I still do. I could sit here and list out all the crushes I've had in the past but that's not what I'm here for. I'm here to ask and get a definitive answer to the question, "How do I know if I'm bisexual or gay?" Recently, I've been jacking off to gay porn and fantasizing about gay things. Shit makes me hard and let me tell you I would definitely fuck someone who's transgendered. I don't want to deny any feelings. I've accepted the fact that I've had these gay fantasies and that having gay sex intrigues me. Although out in public I only tend to stare at female asses and not male asses, I want to know what these feelings mean because they're here for a reason.