Oh the pain! The price of change. I found a padded pushup bra to be most helpful at protecting. I found it funny that for some time, I felt so clumsy with them too. Kind of like when I grew out my fingernails. All those years you grow up with little to no nails and flat chested. Then one day there's something there. I felt like I had to learn how to pick up things differently, button my blouse differently, type differently etc. with nails. Likewise, with new growth out front, taking a turn around the corner without bumping etc. became different.
Isn't it amazing that we humans have taken the time to measure, calculate, and record averages etc. for things on the human body like nipple spread, finger lengths, arm spans etc.