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No, there is a difference between being gay and a type of OCD where your obsessions revolve around a fear of being gay. If you are gay and staying in the closet, that is completely different from and having a type of OCD that is about sexual orientation concerns – which, as you know, is often called HOCD (homosexual obsessive compulsive disorder).
Here are two links to other pages on this website with more complete answers to your question:
http://www.brainphysics.com/hocd.php
http://www.brainphysics.com/yourenotgay.php
Keep in mind that constantly asking questions like this can be a form of checking and reassurance in and of itself, which only strengthens your OCD. If the two articles above sound like your problem, you should get your OCD treated rather than scouring the Internet for reassurance that it is just HOCD.
Best of luck,
Dr. Williams
Monnica T. Williams, Ph.D., Clinical Psychology
No Cost OCD Treatment: http://www.ocdproject.org