I know it's not easy to come out of the closet, especially to your coworkers. And not everyone that you work with is going to be accepting of the fact that you are gay/lesbian. So you really have to scope out what the company your work for says about being openly gay/lesbian. I do know that some places, like Dow, are very accepting of gays and lesbians being in the work force.
Being openly lesbian at work was something I struggled with for a good three years before I knew that it would be okay for me to be openly gay/lesbian at work. My first summer job was at Dow Gardens. That was where I struggled the most with my sexuality. It didn't help that I found myself attracted to some of my co-workers, and was nowhere near ready to come out to anyone when I worked there. And that forced me into this whole other world of not feeling very comfortable. Thankfully I have since gotten over the fear of coming out. The summer after working at Dow Gardens I worked for the local minor leauge baseball team in food service. I still wasn't out to anyone. But I was much more comfortable in my own skin. By the summer of 2010, when I was fully out, including with the minor leauge team that I had worked for the past two seasons, I went back to work for them. The cool thing was that no one interacted with me any differently. The only difference was that in the employee handbook there was a mention that they will and would not discriminate based on sexuality.
My point is, find out how your employeer feels about having employees that are openly gay/lesbian and go from there.