Is this a normal thing to be sad about?

I haven’t had really any friends this past year and I’m pretty shy so I don’t make friends easy. All my old friends stopped talking to me when I stopped making the effort first. Is it normal to be sad that my old friends are all together but I’ve been feeling so alone this year because I haven’t really seen any of them? I don’t get much time to go out but when I try to make plans no one ever responds. Do other people go through this?