Although, Jeremiah's pain was because his people were not listening to and following God. Later on in the chapter God also gave Jeremiah a promise. I decided I had two choices. Or, I could let the pain work in me the fullness in Christ. I am not saying there aren't times of frustration, tears, or that being cranky once in awhile doesn't happen.
Growth takes time.
Pain teaches compassion for those who are in pain. Who can better understand another person's pain than someone who has gone through it. Jesus understands our pain better than anyone. He died for mankind and was rejected by His own people. He suffered emotional and physical pain, like no other person ever has.