You are a new creation, not an improved version of the old you. The person you were died with Christ, and the person raised with Him is loved, forgiven, and righteous by God's own doing. Your identity is settled before you do a single thing.
The Grace Answer
Most people answer this question with a list of failures and a hope to do better. The gospel answers it with a death and a resurrection. When Christ died, the old you died with Him. When He rose, a new you rose with Him. If anyone is in Christ, he is a new creation; old things have passed away; behold, all things have become new.
Read that carefully. It does not say you are the same person trying harder. It says the old has passed away and something genuinely new has begun. You are not a renovated sinner. You are a new creation with a new nature, joined to Christ Himself.
What that actually makes you
In Christ you are forgiven of all of it, past, present, and future. You are righteous, not by your record but by His. You are accepted, adopted as a son or daughter, and indwelt by the Spirit of God. None of that was earned by your performance, and none of it is threatened by your failures. Paul put his own life this way: it is no longer I who live, but Christ lives in me.
Every piece of that is present tense. Not something you are working toward and might reach one day, but something already true the moment you believed. You are not auditioning for the family. You are already in it. This is why your identity has to come before your behavior, never the other way around. If who you are depends on how you did today, you will ride every high and crash on every low. But if who you are was fixed at the cross, then your worst day cannot lower it and your best day cannot raise it. You simply live from a settled place instead of striving toward one.
So when the accusation comes, and it will, that you are still just a failure, still fundamentally the old you, you can answer it with the truth. That person was crucified with Christ. The one standing here now is loved, clean, and brand new. You do not become that by trying. You already are that because of Him, and the rest of your life is learning to live like it is true.