Am I bisexual?

Annie • Hi I'm Annie! 18 years young and I'd like to think very wise! engaged to my wonderful man ❤️
I know this should be a pretty easy question to answer, but I'm just really confused.
I've been sure ever since the age of 14 that I was bisexual.. 
I've had girlfriends, but never done anything more than kiss them.
I've had multiple friends say that because I haven't been sexual with a girl, then I can't be bisexual..
Is this right?
Side note: I prefer watching lesbian porn, as the sight of a penis simply does not turn me on; it's a turn off in fact..
But I am currently engaged to a guy, and sex with him is amazing!
I just need someone to help me, I'm really confused :( 

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