Please help. I am constantly worried I may have contracted HIV?

I'm a 15 year old male and on September 28 I had experimented with another male my age by having unprotected . He was African American (I feel like I should mention this, because I have heard this increases my chances). He told me that he was a virgin. However, I am still hesitant to believe this is 100% true. It was only one time, and I was not exposed to any of his bodily fluids (he did not ). However, I did into his mouth. I know this is a stupid question, but bear with me. I am DEATHLY afraid of contracting this virus. I have never had again and don't plan to anymore unless it is protected. About two weeks after we did this, I had what was described by my doctor as a bacterial infection (strep throat) which persisted for several days. I believe this may have been an acute HIV infection. Should I worry? If not, reure me that I'm over-reacting?