Am at risk for hiv? 30sec unprotected intercourse in sea with a white, no gay, no drug user guy. he says he already got negative results. im scared!

Very low risk: The chance such a partner has HIV is very low, especially if "sea" means you're in the Seattle area. And when a guy has HIV, the woman's chance of infection from a single episode of unprotected vaginal sex is about 1 in a thousand. Little HIV risk, but probably high STD risk. Get checked for gonorrhea, chlamydia, etc -- and probably HIV just to be extra safe. Also, get into the condom habit!