Well, i think this really tests the relationship you have with your parents....
I dont really support the fact that you are bisexual.... but i can tell you that the bond between your parents and yourself as well as your friends will be tested...and they wont look at you the same way again..
My advice to you is to think it over..
Think of the negatives, positives and possibilities that might happen if they were to know..
Well.....what they wont know wont kill you...rite?
I dont think you should tell them... the last person any parent needs to find out is that their daughter is bi....
And secondly, if you dont have a realtionship with your parents, at all, then they wouldnt care whether or not you are.... but all i can do is give you advice... its your decision...your choice whether to tell them or not... the ball is in your court... do you want to tell them?
i still dont think your parents should know about this....but i also think they should trust and accept your decisions...No matter what they are...
So i am throwing some questions out to you, (Realizing all the possibilities)
1. ARE YOU READY TO HAVE THEM ACCEPT THE FACT THAT YOU ARE BI?
2. ARE YOU READY TO LIVE ON YOUR OWN (if they do kick you out)
3. DO YOU HAVE A PLAN? (incase they do kick you out)