It sounds to me that you are really self aware and you understand a lot about yourself. That is a huge plus. It may very well be true that you gravitate towards men but your attraction to your co-worker could mean that you also have the capacity to be attracted to women. You may be in a sub class of people who can be attracted to both sexes for differing reasons. You could be a-sexual. I think our upbringing can mold us into the way that we are. I am a woman. I am not romantic-ly attracted to men. I am not really sexually attracted to men. My father abandoned me when I was 10 years old. (abandonment issues). I am more romantically attracted to women but not sexually. (my mother stuck with me and didn't leave) Am I a-sexual? I really don't know. I will be working with my therapist on this soon. Have you considered talking to a therapist about your concerns? btw...
Welcome to PC. I hope that you get great support here as I have with my own issues.
The site has some great features to include a community calendar with weekly announcements. It also has a resource center. It takes a little while for your first 5 posts to appear as they are being evaluated. Browse the numerous forums and *social groups (*need to join) and post when and where you feel comfortable.
If you need any help in navigating this site feel free to contact a community liaison or moderator. I hope that you find all of the answers that you are wishing for.