I remember feeling the same way. It was just so different than dropping off the older two as there was no kid at home. I work full time so that helped. That first weekend we went to a jazz fest at the beach. But I honestly wanted some time to be a bit sad quietly and did not make a lot of social plans for a few weeks. My youngest is not the most talkative so we often only spoke once a week. It gets better. You get used to them being gone. I spent more time at the gym and took an art class. He came home the first summer but then spent the next ones at school. After his junior year, he and I took a camping trip out west which was a really nice way to reconnect since he wasn’t coming home for the summer.
He moved home last September for what was supposed to be a brief time until he saved enough for an apartment. But between not loving his job and now Covid, seems like he will be here for the foreseeable future. Definitely mostly good having him home.
I am also someone who would do it all over again if I could! I don’t like how quickly time is flying by, even with Covid. We do get out to do socially distant visits with friends, but I worry about what the fall will bring.
Hugs OP!