The kingdom of heaven is not just in saying I am a Christian but living it through the Holy Spirit. Enjoying our life is extremely spiritual when we are real with God. Are you a born-again Christian? If not, you might feel like it is impossible, remember Mark 9:23 says, with man this is impossible, but with God all things are possible. Pray and ask God to take rule over you in your heart and to give you Revelation to know Him and overcoming power to live for Him. He will do it if you asking him in faith Matthew 7:7 Ask and it shall be given you.
Have a lovely day!