I'm bisexual. I actually came out on facebook. That's my personality though, I am totally comfortable with putting myself out there. I want people to like me for who I am not who they think I am. I've also been with the same man for 14 years and we have kids together. So the average person wouldn't know my sexual orientation unless I told them. In my relationship my spouse has always been willing to bring other women into the bedroom too. He's perfectly fine with my desires.
I just want to reassure you that it's okay to be yourself and ultimately your happiness matters more than anyone's opinion. Life is just too short.