Pain in ?

I noticed about 3 months ago that my right felt a little more raised than the other. There was no lump in it but was a twinge when I push the nipple down which didn't happen in my other . I went to the doctors and she checked them and told me that my were fine and to stop worrying. The pain is still there, it is only small but I am still worried. Could it be that I am causing it to twinge by constantly feeling it and being paranoid? Should I trust my doctor?