Did this stunt the growth of my ?! Help please.?

My started growing when I was in 3rd grade. when I would touch my chest, i would feel a small little ball behind each nipple that was very sensitive to touch. They would hurt alot aswell. In school, I got hit many times in my chest area, (by mistake) and every time the pain was horrible! One day, one of the kids from my cl, grabbed a chair and jammed the metal feet of the chair really HARD right into my chest!! This hurt SOOOO much that i had to sit down and breath! I was in so much pain. Later the next day, i touched my to see if i would feel the little sensitive ball and it wasnt there anymore!! The little ball was gone, and my did not feel as sensitive as before. My s never grew any bigger. Iam 20 yrs old now and suffer from really small , and i always blame the kid with the metal chair for this. Is it possible that all the hits to my chest and especially that one horrible horrible hit with the chair into my caused them to stop growing? Hel