Welcome to HCM
We understand your concerns
I went through your description. I suggest you not to worry much. From the feel of it, it does not seem like fungal infection
. Anyhow, doctors are supposed to diagnose the problem from the symptom as well as from their experience. Therefore, it is wise for you to visit a skin specialist for further advice.
Secondly, it is always unwise to have unprotected sex with strangers. Try to be away from it. You are just 24 and you have your full life in front. Concentrate in your career.
Hope this answers your query. Available for further clarifications.