Hmmm. This is a toughy.
Honestly, don't worry about labeling WHAT you are until you're sure WHO you are. Make sense?
What I mean is, don't say you're bisexual if you're not sure. Sexuality is majorly complicated and even though you flirt with one sex it doesn't mean you're necessarily romantically or sexually attracted to them. As well, having a crush on someone of the same gender doesn't necessarily make you a lesbian or what have you.
Really, what you need to do is take it slow. Go about on your own and figure things out. Gauge yourself and really analyze your sexuality and then label yourself and stand strong about it.
Your family will always take it much harder than your friends. Parents don't necessarily know how to react to their child coming out. They want to be supportive and loving but it's often just as confusing for them as it may be for you.
Just roll with the punches and go about things at whatever pace you feel is right. Don't rush into it, don't do anything to appease anyone else, do it your way on your terms that way you can first be affirmed in who you are and what you are without others imposing their judgments or opinions.
Good luck!