Overthinking feeling incomplete. This!

Not sure what is this, everyday I wake up I keep thinking about stuffs that are either can't be done NOW, or try to bring up something to think about, I have goals but I want everything to be resolved NOW, may be that is why I am posting this question here for quick analysis. Have a feeling something is "missing/undone/incomplete" though there is not. Even if I write them down then also keep thinking about the "same things " again and again, sometimes the same thoughts are stuck for days. Can't stay in present, surprisingly that doesn't effect my day to day work, but when I have nothing to keep my mind busy, I keep thinking in a loop between past and future . Please let me know if anything concerning about this