Yes, I have a great life, but I'm well aware that this life is fleeting.  James 4:14 makes this point very clear:   Whereas ye know not what shall be on the morrow. For what is your life? It is even a vapour, that appeareth for a little time, and then vanisheth away.

Let's enjoy all the Lord gives to us, but remember we are only passing through.  The poem "Only One Life, T'will Soon Be Past" comes to mind.

Romans 12:2

And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.