It may surprise you to learn that you've already taken the first step toward a new life by admitting you're weak and need help. The person who's in the greatest danger is the one who thinks he or she is strong enough and doesn't need help from anyone, including God.
Now, take the next step by actually turning to God, telling Him that you know you're weak and need His help. God wants to come into your life and forgive your sins -- and He will, as you ask Christ to take over your life. Only one thing separates us from God, and that is our sin This is true for every one of us, no matter who we are. But when Jesus died on the cross, all your sins and your guilt were placed on Him, and He died in your place. The Bible says, "This is love: not that we loved God, but that he loved us and sent his Son as an atoning sacrifice for our sins" (1 John 4:10).
But God not only takes away our sins when we come to Him; He also comes to live within us by His Holy Spirit. Think of it: God actually lives within you once you commit your life to Jesus! And when temptations come, He is ready to help you.
How will He help you? One way will be by surrounding you with other Christians to support you. Don't fight your battles alone, but fight them with Christ and His people.