I watch lesbian porn but have a boyfriend should I feel guilty?

I always had this thing for lesbian porn, I get turned on soooo much. I have questioned my sexuality before. I'm 18, and I been dating my boyfriend for almost a year. The thing is that when me and him have sex I do enjoy it but I feel that I would rather enjoy it better with a female. I feel so horrible and such a bad girlfriend, I sometimes masturbate when I watch it (I'm not a pervert or disgusting) should I feel bad about it? The thing is I don't know if I like male or female. I have a really strong connection with him and it would hurt if I lose him but I'm very confused on my sexuality never done anything with a girl but I know I'd always had theses thoughts since I was in 7th grade. Should I tell him? Please help 😣