When you look in the mirror today, whose reflection do you see? May I suggest to you that it is not someone else’s reflection in that mirror, although that’s what we sometimes “see.” Too often we look at our reflection and try to compare ourselves to others. But that is not realistic, not wise (2 Cor. 10:12) and not healthy. 
May I suggest to you that it is not your old self in the reflection in that mirror, although that’s what we sometimes “see.” We sometimes focus on past mistakes, shortfalls and problems (or even compare ourselves now to some personal greatness and achievements in the past). But that, too, is not realistic, not wise and not healthy (Phil. 3:13).
So, whose reflection do you see in the mirror today? Rather than “see” what is not there (i.e., someone else or your past self), “see” where you are today in your relationship with Christ. That’s all that matters! Do you “see” Christ in you (Gal. 2:20; Col. 1:27)? What do you need to change, in your reflection, to look more like Jesus (2 Cor. 3:18)? That’s all that matters!