Still trying to find this song. It will not go away. It may have this chorus:

I know I've spent a lifetime trying(?)
But I've got it all figured out.
Everybody's lonely,
Everybody's lonely,
Everybody's lonely,
That's what it's all about.

My greatest fear is that this is the chorus to yet another song. Help, help, help!!!!

The singer is male, a tenor (I suspect), and a songwriter.

Roger in Baltimore