You may expect that if God wants us to believe that He exists, He would reveal Himself to everyone in a supernatural way. However, if He did that then wouldn't He end up revealing Himself the same to everyone? Wouldn't it end up looking natural to many people, just because it would not seem special?
There are three specific ways that God has chosen to reveal Himself. First, in His Word, God proclaims that, “The heavens declare the glory of God, and the sky above proclaims his handiwork.” (Ps 19:1 ESV) Creation cries out that God exists. The greatness of the universe proclaims the greatness of God just in shear awe. Every living cell proclaims the amazing creative wonder that God is, by the complexity that each cell contains. It seems so simple because it is so small but could a living cell really come about by chance? It has complexities that make it impossible for it to have come about by chance. (See The Design and Complexity of the Cell or Darwin's Black Box)
Second, by sending His only Son to reveal Himself. (John 14:8-11) In sending His Son, the Father not only proclaims His own existence but demonstrates the love that He has for us sinners. “For while we were still weak, at the right time Christ died for the ungodly. For one will scarcely die for a righteous person—though perhaps for a good person one would dare even to die—but God shows his love for us in that while we were still sinners, Christ died for us.” (Romans 5:6-8 ESV) That is truly amazing; that while we were still enemies of God, He sent His only Son to die in our place! Then to confirm that Jesus really was the Christ, and to give irrefutable evidence of the resurrection, Jesus was raised back to life on the third day from His death. (To learn more about the actual evidence of Jesus' resurrection, see The Case for Christ.)
Third, He gave us His Word so that we would have all the information we need to believe. As He tells us in II Timothy, “All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness, that the man of God may be complete, equipped for every good work.” (2 Timothy 3:16-17 ESV) There is nothing necessary beyond the Scripture. (The Case for Christ looks like it has a good defense of the reasons Christians believe the Bible to be true, or see Is the Bible True … Really?)
In Luke 16 Jesus tells a parable of a rich man and his poor neighbor Lazarus. The rich man had no fear of God and seems to have only lived for himself. When both of them died, Lazarus went to heaven while the rich man went to Hell. In Hell (or Hades) the rich man was so tormented that he wished for just a drop of water to be put on His tongue. Finding that this was not possible, he remembered his unbelieving family, and requested that Lazarus be sent back from the grave to proclaim their danger to them. Abraham told him that if his family would not believe the Law and Prophets then they would not believe a man raised from the dead. (“Law and Prophets” is a way of saying the Old Testament or the part of the Bible that existed during Jesus' life time.)
I encourage you to examine the claims of the Resurrection of Christ for yourself. But at the same time I encourage you to examine yourself and ask if it is because of pride or an unwillingness to give up sin that you will not admit that God has revealed Himself. Jesus wants you to ask Him to pay for your sin so that you can know God yourself. Do not let your imperfection hold you back.