Here are a few resources to help you with this:
John Wesley’s Holy Club Questions – No, I’m not a big fan of John Wesley, but these questions are outstanding. Ask yourself these questions honestly and you’ll see where your devotion really lies.
The Resolutions of Jonathan Edwards – Edwards also attaches some wisdom about their use right at the beginning: (1) read over them once a week and (2) remember that they’re for God’s glory, not so you can think yourself a super-Christian (like the Pharisees).
Three From Richard Baxter (author of The Reformed Pastor):
Signs of Living to Please God – Turn these into questions and ask them of yourself.
The Ten Marks of a Flesh-Pleaser – Helpful for those who serve the Lord (which should be every Christian). Do you serve to please others, or the Lord?
Directions for Hating Sin – Not so much for self-examination as for guidance so that your self-examination is encouraging rather than discouraging.
A modern list:
Self-Examination Questions – from a Christian blogger in the UK
And a secular list:
20 Questions You Should Ask Yourself Every Sunday – Amazing how unbelievers come up with things that Christians have been doing for centuries and then act like they’ve created something new.