I am the man] The author is a representative sufferer, an eye-witness, and typical of Christ.
Related Commentaries of Lamentations 3:1
Lamentations 3:1-3
1 I am the man that hath seen affliction by the rod of his wrath.
2 He hath led me, and brought me into darkness, but not into light.
3 Surely against me is he turned; he turneth his hand against me all the day.