There are lots of people in the world in a similar situation to yours, myself included. I've known I'm bisexual since my early teens. I liked girls, but in absence of any luck finding a girlfriend, I turned to my male best friend and we have a homosexual "sexual" relation for a while. I eventually found a girl, married and had kids...but I'm still bisexual.

I feel lucky that I have actually experienced sexual relations with both sexes...I do KNOW who I am. I too would like to have a life with both male and female sexual partners. The reality is that this just doesn't happen...no matter how much we want it to.

As Jelly-Bean noted, you need to follow your instincts and figure out what you really want. So long as you are comfortable with your own sexuality and desires, what other people may or may not think is irrelevant. I am comfortable stating that I am bisexual (to those that matter), and I have no issue telling those people that I still have desires for men (I tell my wife at least monthly that I'd like to have sex with her and another guy). You need to find your comfort zone "inside you" before you seek to find it with the rest of the world.