Does this sound plausible, or was psychologist right?

I told a psychologist I was seeing, a psychodynamic one, that I thought I had anxiety in social situations because I was picked on iin elementary school. She asked me, "why did they pick on you". I am now doubting myself. Do you think social anxiety can come from being picked on a few times, that were really stressful? Or, do you think the person was picked on for a reason, and that they were thus the cause of the bullying and the cause of their anxiety?