A dream does not define who you are. Dreams occur for a variety of reasons and often times what you are trying to work out in your head has no literal meaning to your dream.
For example I have dreamed of a male co-worker that I do not find at all attractive, but in my dream I had a sexual relationship with him. Does that mean deep inside me I am attracted to him? No, not at all. It could be a variety of reasons of why I even dreamed of him. Maybe at the end of the day he was who I spoke to last so his imagine was in my head at night or we were working out a work problem, even though my dream was sexual in a sense perhaps he was in it as in my mind I we were trying to solve this issue.
The mind is complex and most of your dreams are not literal to how you feel emotionally or mentally. This dream is no indication of how you are sexually and your sexual preferences. It was simply a dream. Just think of any weird dream you have had previously is that really an indication of how you are/feel? Just the same as this dream.
I cannot answer why you are so obsessed with it other to surmise you are very worried about this. It is just a dream ... let it go.