Boobs

I'm 22 and I've been self conscious about my body for long time, but I'm working on it. The one part of my body that I've never been self conscious about were my boobs. I will go braless when I go out. Not all the time but there are times I forget to put a bra on. Usually with loose fitting close or if I'm wearing a sweatshirt. My mom flips when she realizes I'm not wearing a bra. She very modest when it comes to way women should dress. They shouldnt show off too much skin, no low cut shirts or short shorts. She doesn't seem to understand that I'm not like that. I don't wear clothes that are to revealing because it makes me uncomfortable. I wear clothes I'm comfortable in. I absolutely love my boobs. I'm not ashamed to walk around without a bra. Why does it matter if I wear one or not? I wear something over them so it's not like I'm walking around topless.