With this, I believe first impression lasts, given that some of my friends still remember. Maybe, firsts are really instilled in our brain hard. Though, I also believe that not all first impressions matter in the long run, especially when it's not the real you. Maybe the first impression says so much about the one taking us in instead of us coming off as something.
Do you ever ask yourself who you really are? It is the exact reason why I love the Jungian concept. It shows how we are layers and layers and layers and layers of different personalities. It is not like a part of you is fake; it just suggests that we are all capable of change and growth.