Let's flip this question in its head: If Jesus is asking who do they say I am, he is asking us: "So who do you think you are?"
Now, I don't think that Jesus is asking this question as a snooty teen would but with seriousness. He is asking us to look deeply into ourselves and be honest with Him and us. After all Jesus knows our hearts, knows our prayers before we pray them, so he knows us already, why lie to Him, to ourselves? We lie so we look better to ourselves and hope we can fool Jesus that he doesn't know what He knows. We lie out of shame, like Adam and Eve covering themselves when they knew that God knew they were naked.
So how will you answer the question Jesus asks? Answers would be a varied as the people who are asked and answered. Answers will be based on ego, I think I am great, or emotions, I know I am unworthy, or difficulty, I am so broken by this or that. Views of God comes from our own familial experiences, outlook on life, crisis, tragedy can make God seems distant, revengeful, magical. Our views of God will affect our answers. And to be clear about our relationship with God we will have to take in consideration our view, is it real or is it based on warped perceptions?
The Ignatian Examen of Consciousness will help us adjust our vision:
1. Recall that you are in the presence of God.
2. Spend a moment looking over your day with gratitude for this day's gifts.
3. Ask God to send you His Holy Spirit to help you look at your actions and attitudes and motives with honesty and patience.
4. Now review your day.
5. The final step is our heart-to-heart talk with Jesus.