I think this song means, that you should not try to achieve an unrealistic aim, but just live and make the best of your life. You should try to achieve things, you go for that ones you CAN achieve, so that you have had a fulfilled life.
"wir haben unser Leben noch nicht gelebt
so lange man uns nich auf den Friedhof legt!"
should mean, that with the live they live(with aims you can not achieve) will first be fulfilled, when they die.
I think this song means, that you should not try to achieve an unrealistic aim, but just live and make the best of your life. You should try to achieve things, you go for that ones you CAN achieve, so that you have had a fulfilled life.
"wir haben unser Leben noch nicht gelebt so lange man uns nich auf den Friedhof legt!" should mean, that with the live they live(with aims you can not achieve) will first be fulfilled, when they die.