Its their construction of body..
Some have small areola and big chest, some other have bigger areolas but normal chest.. Your body (and areola) are in the zone of "normal". But im totally sure that if you lost fat, they will look smaller (shrink a little) due to the fat you do have now there and make them look bigger. Even though if we can say a "perfect" areola takes 9/10 yours take 6/10 now, with the fat you do have.
Honestly, me and all others dont say it to comfort you, neither because we are in worst or better position. Dont look the perfection -there isnt out there, just do excerice because only this you need and you will achieve the best.