No nipple

So I breastfeed for about a month and then I went to pumping only....pumped only for about a month and then I couldn’t keep up so I stopped. I have noticed lately with my boobs that they feel loose and kinda fatty feeling, they aren’t as firm as the use to be (hard to explain) and then I have noticed that it’s like I don’t have a nipple anymore. I had smaller nipples to begin with but now it’s like there’s nothing there...they are way flatter than they use to be. Is this normal? Has this happened to anyone else?