Why do we do anything we do?

The answer to this is:

to feel good

You might like to think about that the next time you do something. Then the next question is:

did I know I was doing it to feel good?

The answer is probably not. You probably layered a thousand other explanations on top of your actions, but ultimately we are slaves to feeling good.

The final question is:

did the good feeling last?

Usually, not for very long. Which is a bummer.