Help please, so confused!

I'm a 18 year old female and I have a partner who I've been with for 2 years, I'm not a virgin but I'm not sure I like boys? i mean sex is great and all but I find myself starting at my friends boobs and wondering what they look like naked, weird I know! but I'm so curious about them and any female in general.. I find myself watching lesbian porn and I love it, seeing a vagina turns me on but seeing my boyfriends penis is just like.. meh it's a penis and it feels good inside me but that's it. my family are religious and I'm so scared I might turn out to be a lesbian and they will hate me! please help. so my question is am I likely to be a lesbian when I get older?