I can’t change my skin anymore

I don’t know if this is happening to anyone else, but I can’t change my skin anymore. Let me start from the beginning. I had a Character skin on for awhile now, and wanted to change it. But when I did,the skin I was wearing before showed up on the model type thing that shows up after you pick a skin. I tried to change to multiple different skins, when I came up with the idea to pick a different type of model. When I did though, I couldn’t see the skin at all, and whenever I tried changing it again, it just showed up invisible, and when logging into a world, the default Steve skin with the yellow shirt was my character.