You cannot have HIV from the environments and exposures you describe. You intellectually know this but cannot get yourself to believe it, which proves the purely psychological and emotional nature of your problem. See a health professional, be frank about your concerns, have an HIV test to help prove to yourself you do not have it, and expect that professional to then refer you for mental health care. And accept and follow that advice when it comes. I suggest it out of compassion, not criticism.
I will have no other comments on this thread. If you want to continue a discussion, take it to the HIV Support forum. But that is not a substitute for getting the care you need.
HHH, MD
Have you been to the doctor to treat your OCD? B/c it's as clear as day that this seems to be your illness here. It's quite amazing that your OCD has you posting on an HIV forum. Hiv isn't your problem but maybe you should start addressing what is the issue here. Good luck & don't let your mind take away from anymore of your life than it already has. Time to start living.
My friend, your problems are all in your head. You could not have possibly contracted HIV in any of the three scenarios you list.
However, you are clearly suffering from chronic anxiety. That's where your real problem lies. See a mental health professional to address your unwarranted fears.
But HIV is not an issue. It's as simple as that:)