'Bitter' in the Bible

"Why does God give light to the sufferer or life to the bitter person:

"In addition, I won't keep my opinion to myself; I'll speak from my distressed spirit; I'll complain with my bitter soul.

You've accused me of bitter things; you've caused me to reap the sins of my youth.

Others die with a bitter soul, never having tasted the good life.

"The living God has withheld justice from me; the Almighty has made my life bitter.