Say this to explain something that you want, which you think should be easy to have.

For example:

All I want is a job where I can make a decent living.

All I want is a little time to myself.

All I want is to go home, play with my kids for a few minutes, watch some TV, and go to bed.

People usually use this phrase when they're a little frustrated.

You can also say "All I want to do is ___" followed by some action.

All I want to to is go home so I can snuggle with my little angels.