You're 13 and too young to be engaging in any adult type activities, some things are better left unsaid, you don't have to share everything with everybody including your parents, keep this to yourself and mature a little bit longer, and then maybe in time and only when it's appropriate then you could reveal it to them...
are you really bi? are you willing to kiss a girl??? if yes, then tell them something like this : Mom, Dad, I just want to tell you that I like guys, but I also like girls... They won't kill you if they love you... they will only be mad then they will accept you
Is there a reason for telling them now? Unless you plan on flaunting your sexual identity in front of them any time soon, I'd hold off on telling them. If your parents and you have had an open daily dialog, there's a good chance they already know. Good luck.
I think you should just come out and tell them. I mean they can't sit there and hate you forever. You've got to do something and it's about time a lot of people decide to go against sexuality traditions and be proud of what they're interested in.
I'm trying to figure out what to do myself. (I'm bi too) . I'm not worried so much about acceptance as i am about them telling everyone they know. You could explain to them that you want to pursue both men and women, alot of extremely religious people detest homosexuals sadly but maybe telling them you like the best of both worlds. I really don't even know what to say so...
Are you saying your just attracted to other girls? I hope your not sexually active at such a young age. You should not say anything until you have matured enough to become sexually active, give it 5 years then you'll know what you really want.
They're your parents, they might be hurt at first but i'm sure that they'll still love and support you the same. The best way to bring it up is to just sit down with them and tell them that you need to have a serious talk with them. Then tell them that you are bisexual and tell them that you don't want them to treat you any differently.