Matthew 7: Words I never want to hear from God

"Not everyone who says to me, 'Lord, Lord,' will enter the kingdom of heaven, but only he who does the will of my Father who is in heaven. Many will say to me on that day, 'Lord, Lord, did we not prophesy in your name, and in your name drive out demons and perform many miracles?' Then I will tell them plainly, 'I never knew you. Away from me, you evildoers!' (Matthew 7:21-23)

How terrible would it be to live your life thinking that you are doing everything to be a good Christian and living for God, and then one day you died and was placed before the Judge and made your plea: God, it's me! I grew up in Your church all my life- never missed a Sunday. I went to all those missions trips, did my QTs almost everyday, and always showed up to church meetings and events. Remember me?? Then God replies with Matthew 7:23, "Then I will tell them plainly, 'I never knew you. Away from me, you evildoers!'" 헉....... That puts makes me nervous and a bit afraid to think that all my efforts, if they are not wholly for God, are eventually meaningless and all in vain. Where is my heart?