When you curse God, you are angry at Him, and you are condemning Him and telling Him He is wrong and you hate Him. More than that, you're telling Him you don't want anything to do with Him–and that is very serious. It tells me you're on the wrong path in life–the path that leads only to Hell.
But listen: It's never too late to turn to God. Yes, you may be angry at Him for some reason–but God loves you, and He yearns for you to be at peace with Him. He loves you so much that He sent His only Son into the world to die for your sins. You deserve to be cursed by God and condemned for your sins. But Christ took your curse upon Himself, and He was condemned in your place.
This is why I urge you to repent of your sins and turn to Christ. He has bridged the gap between us and God, and now He offers us God's free gift of forgiveness and new life. The Bible says, "Therefore, since we have been justified through faith, we have peace with God through our Lord Jesus Christ" (Romans 5:1).
Give your life to Christ, and let Him turn your anger into love–love for God, and love for others. Why stay on your present path even one more day? Instead, by faith open your heart to Christ's transforming power. He can turn your cursing into praise, and your anger into joy.