Learn English – What do you call someone who is conducting surveillance

Well burned out is a good term.

You could also say you are exhausted both physically and mentally. But you could sum that up with frazzled.

exhaust physically or emotionally

Now someone who is over the edge and is openly expressing their frazzledness is jaded.

noun: an old or over-worked horse

verb: get tired of something or somebody

verb: exhaust or tire through overuse or great strain or stress

Now these two terms - frazzled and jaded - are terms on how someone would describe you. You would not usually say you are frazzled or jaded... well maybe but not unless you are talking amongst good friends or a shrink.

You would say, "I am fed-up!"

Or "Take this job and shove it!"

Or "Fuck this shit!"

Or "I can't stand it!"

But then we would describe you as hostile.

There are so many words to describe this because there are so many in the apathetic boat.

Oaf means someone who is clumsy and foolish, but doesn't say anything about intent or how others perceive the person. A lovable oaf is more specifically what you mean, but of course isn't a single word.

Come to think of it, buffoon is really close, but maybe a bit more insulting than your intent.