I'm exhausted
Examples
I've been dating since I was fifteen. I'm exhausted. Where is he?
I'm exhausted trying to stay healthy.
I'm exhausted almost all the time.
I know that I've overfed myself trying to prop myself up because I'm exhausted.
If I'm exhausted and I just don't feel like it, then I don't do it. I am a human being, after all. But I also know I'm the kind of person who, if I take one day off, well, it's very easy for me to take the next day off and then quit exercising.
I don't know how everyone else feels, but I'm exhausted.