It's your body, so you can do what you like with it.
It sounds like you are afraid that your commitment won't be returned. Seeing as you have said you are bi, do you feel the same way about women as men, right now?
Have your relationships with women turned out the same as with guys? Might be a clue there as to what is keeping you from expressing yourself, and letting you form a good, caring relationship.
Just my own suggestions. I hate to be asked for, or give, direct advice as I am having enough trouble running my own chunk of the Universe most of the time.
Karen.