I just failed my first college exam that everyone else passed

This is my first time failing an exam. I never have before since it was my first subjective History and systems of Psychology exam. I thought I would be able to pass but ended up failing. I don't feel confident now taking any exams. I feel terrible. Everyone around me just passed, (even my friends). I failed. I feel awful. Please can anyone just lend some support or what other mistakes I did?