[growthspurt]

I am joining the gym and i also want to do chest excercises. I am going to bulk because i am underweight. Since im going to be drinking whey protein a lot lately ive been wondering does that help my breast grow? Also i know the breasts arent really muscles but i heard creatine creates lean muscle mass while burning fat (except water weight) and my thing is if im doing chest excercises (even while bulking) would that make me loose fat from my breasts? I always notice girls who are actually weight training dont have that much breasts but then again they dont bulk, most likely they cut or maintain. Any help? Also my diet will be around protein & carbs (complex carbs to be exact).