Small boobs

Mary • My beliefs and opinions are constantly evolving
I'm not gonna post a picture since I'm under aged, but my boobs are small and I'm pretty sure they've gotten smaller? I know it sounds impossible, but they feel smaller, look smaller, and when I used to lean on my side it would create cleavage and there wouldn't be a gap between them anymore, but now there is even when I do lay on my side. 
I don't understand how this happened? Did my boobs actually get smaller? I thought bc I was growing or something, but I measured my torso, heights, arms, and shoulder and they're all pretty much the same... Someone help please