Will he care that i have small boobs..?

Me and this guy are fooling around and were getting pretty serious,
he hasnt yet seen my without a bra on and i have like hardly anything there! of course he has felt and stuff but, i have little self esteem when it comes to my boobs, will he mind that they're small? They are still growing and one is slightly bigger than the other like most girls/women,
what should i do?