Women between age 18-40. Body issue?

I'm an 18 year old female. I weigh 120 lbs and I'm 5'3. My boobs are about 36 C, which is fine, but I tend to have a chubbier face and my stomach is a bit flabby. Did you women lose the baby fat, and at what age? Or did you have to do anything in particular to lose the chub?