Why are my shoes suddenly tight on me?

I thought that at my age my feet were done growing. But for some reason, my one and only pair of shoes are tight on me and they make my feet hurt all over. When I first put them on before I started my walk, I felt like I was getting a blister on the back of my ankle area. Then when I came back and in my room, my feet hurt all over and now I've been trying to get a break and give my feet a break by laying down. But why are they suddenly tight? And do I need new shoes?
Why are my shoes suddenly tight on me?
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