In the 11th grade I went off to boarding school and the first couple of weeks I hung out with some guys I thought were cool. One night they decided to take Xanax and I had never been exposed to drugs but I took one. Later that night one of the boys got caught and told on everyone. Our school drug policy was that they take us to the ER and have a drug test. I failed the drug test but was allowed to stay in school. I went to a drug counselor for one session and it was concluded that I was a smart kid who just hung out with the wrong people and made a stupid mistake. I was put on a strict random drug test until my 11th grade year was over and I passed everyone of them. Now my 12th grade year is coming to an end and i'm getting ready for my 1st class medical. I know I have to expose to the FAA that I failed that drug test, but I want to know if failing that one test could ruin my opportunity of receiving a medical. That is the only big thing in my medical history and i'm worried about being deferred. I have all the medical records and counselor statements ready to give to the AME, but i'm wondering what he will think. I just made a stupid mistake and I don't want it to haunt me.