Welcome to the forum and thanks for your question.
But you're asking something I really am not prepared to much about. This isn't an HIV/STD risk question. You correctly understand the risks are nil, based both on the low chance your partner had HIV or other active STDs (people rarely lie when asked directly) and the nature of the exposure.
What you're asking is my judgment of whether or not your "concern" (anxiety is what I would call it) is influenced more by your conflicts about your sexuality, and by this particular sexual choice, than by the actual HIV risks involved. Your judgment of that is much better than mine. I'll just say that whenever someone sugggests his or her own concerns have an emotional origin, usually they do.
In other words, your question itself contains its own answer. It seems to me you would benefit by talking this through. You might start with a local gay men's support group, which should be easy to find if you're in a medium to large metropolitan area; or a psychologist or other mental health professional. Of course I suggest it out of compassion, not criticism.
Best wishes-- HHH, MD
You're welcome. Glad to have helped.
Thank you so much! My nerves are much calmer now, I will most likely look into a support group or a therapist to settle my internal issues.