Inverted nipple - Breast clinic referral

I went to the GP with an inverted nipple and now have a breast clinic appointment. 
I'm 23 and the doctor didn't seem particularly concerned but just wanted to be cautious. But I get very anxious with hospitals and examinations and I wanted to see how often people end up having biopsies for nipple inversions as I am extremely needle phobic and nervous for my appointment.

Thanks.