The grass is always greener on the other side of the fence

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Meaning:

You use this proverb to say that the things other people have or their situations always look better than your own,
even when they are not really so.

It is often shortened to "The grass is greener on the other side," or even 'The grass is greener."

Example:

Don't compare your talents with others. The grass is always greener on the other side of the fence. Just do your best.

You might think you'd be happy if you were working in my company, but, well, the grass is greener on the other side.