A Serious case of....bi-curiousity?

I think im biual because i love my b/f but wanna be with a girl... We wanna try a 3some but im scared because I dont know how to put my-self out there like that. I need help being comfortable to actually do this.. I need advice and guidance. He makes jokes about me being gay when I watch a girl on girl ... and I do I just dont know how to say it.. I dont know what to do I wanna be with a girl yet I wanna be with a guy at the same time.. I dont mean to sound freaky..but other sites dont state are you seeking biual.. so what is it am I paranoid or is this bi-curiousity. i wanna try new things but im scared., I shouldnt be scared because alot of doors have opened up of different people. i mean we have a black prez i shouldnt be scared.. I NEED HELP ASAP.