I haven’t had my second period for a year?

Patient: I’m 13(almost 14),I weigh 103lbs or 7.4st and had my first period in February last year. I wouldn’t say I’m under developed because I get the symptoms for my period but I haven’t even had any spotting and I have hips and average sized breasts. I’m just getting a little worried because I have heard about people having irregular periods (my friend didn’t have hers for 3 months)However, is not having a period for a year normal?

Doctor: