My stupid studies

I don't understand. I think this is very bad. We took a practice test, and I scored less than 60 out of 100. And recently, I found out from a friend that an acquaintance of ours scored almost 100 points. It makes me very sad to realize that I'm a failure. Even though I've been studying with tutors for a very long time and preparing for my final exams, I don't feel any results. I'm constantly pressured by the single thought that I won't pass the exam and will be unhappy for the rest of my days. Such thoughts are simply killing me. I don't know what to do about it. I really want to discuss this with one of my friends, but I'm afraid.