Blessed are those who mourn, for they shall be comforted.
It is no surprise that you have sorrow in your life. It is a result of the sinful world in which we live. Jesus promises us that one day there will be no sorrow, no tears, and no mourning. His promise is trustworthy, but it comes with a condition. Only those who have a personal relationship with Jesus may enjoy such great a hope. It is only after the kingdom of Heaven is fully come that Jesus will wipe away every tear (Revelation 7:17).
This is the ultimate of comforts. As a child of God, you possess a hope that unbelievers cannot obtain on their own. We know that pain and suffering fall upon the righteous and the unrighteous alike. The difference is not in the fact that we all must mourn, but it is found in the nature of that mourning. As a child of God, your mourning is only temporary. You have a promise from God that your affliction will not last forever (Psalm 30:5). Those who are outside of a relationship with Jesus mourn alone. Their comfort is only temporary. As a child of God, you are promised that God will be your comforter (2 Corinthians 1:1-11). He is always with you (Matthew 28:20).
Our suffering and our mourning is unavoidable. It is not, however, eternal. I encourage you to take joy in the promises of Jesus. If you are currently in a time of mourning, search the Bible out for those promises. Nothing heals the hurt of humanity more than the words of our sovereign and merciful God!