The first step in living an authentic Christian life is to turn to God in repentance through faith in Christ Jesus as Lord and Savior. If you've done this, and you want to experience more and more of God's grace and peace in your life, then what you need to do is come to know Him better. How do you do this? You do this by spending time with Him.1
As we spend time with God, we begin to renew our mind. Our desires and thoughts are no longer on the sinful ways of the world, but, rather, we begin to see things as God sees them.2
We need to spend time with God in daily Bible study. Not just reading the Bible and then forgetting what it says, but, rather, putting it into practice.
We also come to know God better by spending time with Him in prayer. Just lay your heart before Him and allow Him to minister to you.
Be aware of who you are (a child of God) and live accordingly. Desire the things of God and don't allow sin to rule in your life, but, rather, righteousness.3
Get involved in a local Christian church that teaches the Bible (the church will help you immensely in maturing as a Christian.)
Finally, you need to be around other spiritual Christians, not those who would have you live a life of sin.
As you fall deeper in love with God, you will desire more of the things of God in your life, and
He will give you the desires of your heart.4
1 (2 Peter 1:2)
2 (Romans 12:2)
3 (Romans 6:11-14)
4 (Psalm 37:4)