A set of questions from You Can Change, intended to help you discern whether you are functionally trusting in Christ to be your justification:
Do you ever get angry or brood because you want to prove you're in the right?
Does your Christian service feel like joyless duty?
Do you ever feel the pressure to perform?
Do you serve others so you can feel good about yourself or impress people?
Do you worry that you won't make the grade in life?
Do you enjoy conversations about the shortcomings of others?