I've read that it's very important to learn how to breathe properly, but I just don't get it.

I feel like I "Breathe" correctly, my belly is rising without my shoulders/chest going up, but I FEEL like I'm inhaling less air than I do when I breathe from my chest/shoulders.

Is this normal when starting out? Is this how it should feel? is the "feeling" just a mask and that I'm actually inhaling more than before?