hi im from india, 22 year old male. i never had sexual intercourse and intravenous drugs til now. but i have solo masturbated inside dirty public toilet several times. As it was dirty public toilet, if there was hiv infected bodily fluids on door knob or toilet seat. unknowingly if i had touched infected bodily fluids and used the same hand to masturbate and clean the semen from the tip of my penis. is there any chance of getting hiv or any std from the above mentioned scenario. please explain broadly and clearly. im having huge paranoid and anxiety about hiv transmission.