Willy Says "A man cant go out the way he came in, Bean, a man has got to add up to something" what does he mean?

This is part of Willy's illusion of the American dream. He thinks that a man comes in and amounts to something. He goes out of this life having achieved his goals on his own. Unfortunately Willy has nothing but shattered dreams. Willy could never achieve what he thought would make him happy.