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Reaasure me about STI transmission?

I'm male.

So i had a panic after being with a new partner. That's all in hand now, awaiting test results, will be surprised if they find anything (meh, I'd believe cold sores or herpes...).

What my brain is now focussing on is: i was in a building full of people who are statistically likely to have STIs. I had to use the shared bathroom (nope, not a seat question...). I touched handles and taps, then had my hands near my genitals. I also found later that day i had a papercut on my finger (though i am pretty sure that came later).

Are we talking lottery odds as to me having picked up something while i was there? In my mind the previous people scratched their sores and rubbed their blood on the taps and ive then touched them with my papercut and brushed my hands on my penis and so im now carrying STIs. I do know how stupid and unlokely that scenario is btw... but its occupying my mind.

Help me before i end up in a neverending loop of getting tested... please...