God uses pain and suffering on Earth to develop us into better people, to shape us as Christians. It is how we handle pain and suffering at hand that matters. Read the book of Job. God allowed his suffering but rewarded him two times of what he lost. If we keep strong through this never ending pain on earth, we will be given our eternal reward in heaven, where god allows no pain.
And we know that all things work together for good to them that love God, to them who are the called according to his purpose. - Romans 8:28 KJV
Take what it says in (Romans 5:3-5), find glory in your suffering, suffering produces perseverance; perseverance, character; and character, hope. Hope does not put us to shame, God’s love has been poured out into our hearts through the Holy Spirit, who has been given to us.
“And not only so, but we glory in tribulations also: knowing that tribulation worketh patience; And patience, experience; and experience, hope: And hope maketh not ashamed; because the love of God is shed abroad in our hearts by the Holy Ghost which is given unto us.” - Romans 5:3-5 KJV
Whatever pain / suffering you are going through has no match to what glorious wonders God has in store for you in heaven. Stay positive, keep looking up, this is not your home!