/lit/ - Literature

>>11673742
You can still try to change things despite not "worrying" about them. You can recognize that something in your life is harmful or inefficient, and actively work to change or remove it without ruminating over it and letting the thing make you miserable.

As for the point about thinking, you're pretty much right. Try bringing attention to your thoughts and noticing any of them that are repetitive and/or negative. For some people these thoughts make up a huge proportion of what goes through their heads, especially if there's a mental illness present. The point is to use thinking for problem solving and not problem making.
But not living inside your head and "not doing anything" are very different things.