Difficult situation. I do not now how your work environment is and could not exactly found out which country or internal work environment you have to operate. The largest problem is your outcome. After getting out of the closet myself, (working for the royal air force and several security company’s, which are not especially gay environment friendly employers my life got much easier, but I am living in the Netherlands which should be a very tolerant country. It also depends how you cope with insulting remarks and your own self confidence. Maybe this problem can be discussed with a trust person inside your company. In Holland this is a mandatory job for every company so I am not sure if this advise is relevant for you. This person is the responsible person to help you after your coming out and to consult your direct colleagues if you having problems to do it yourself.
Easy talking from the sideline but I hope this will help you making some decisions to solve this problem.
After the first obtacle is taken I hope for you the path is cleared to discuss this with the colleuges mentioned. The worst thing that can happen is that the reject yout advances. In either way you no exactly what your position is an maybe you can put them out of your mind.