At this point, having already arrived at a future point I want to say I envisioned before I started med school, my "environment" is quite different. Retrospectively, a lot has changed on the "exterior" of my life. I've retained a "core" of my past ante-medical school life, and the fundamental foundation is mostly the same, but a lot HAS changed. And I must say, even in hindsight, I can only offer the idea that your past is dead weight to keep you from where you want to go. You've got to be able to jettison a few things in your life, a few people in your life if you really want to do this. You DO want to be rooted in some of your past. But you don't want to be anchored down or held back by it either.
It is naive, or at very least, idealistic to think that your life will be the same once you start medical school. So it's useful that you recognize/understand that it will be different, should you accomplish what you are setting out to do. Be that as it may, whatever/whomever evolves into "dead weight" in the end is better off left to NOT hold you back. My friends I no longer have (because the "demand" on their friendship was too much to bear during med school), I believe weren't the best people to have in my life. My ex-GF ante-medschool, I suppose, same thing. My former lifestyle, also not what would bring me the happiness of where I am now. I feel it was an extravagant life if I measure it up to what I find pleasing to me now. Med school has a way of reducing you to an "efficient" participant in life. It is a pruning process, and in the end what is left of you will be the best of you - hopefully!
Along that line, was I stoked about my evolution up to now? NO. Some of the changes I resisted. However, the pace and pressure of med school forced me to accept these changes. When I broke up w/ my ex, I had NO TIME to really wallow, or even go for any form of let's say "closure". Is growing apart from friends satisfying? NO. But I had exams!! Hours and hours of material to consolidate into memory. I had Step 1 to focus on. And so forth. You'll know who really cares about you once you are in med school to say the least.
Granted, in the end, do I completely turn away from every single thing or person I am currently w/o in my 4th year of med school - I don't believe that either. I DO miss some of my friends in my previous life. I DO miss some of the things I used to be able to do ante-med school. However, after I am a doctor years from now, if I revisit a friendship, or an aspect of my past life, it will be on different terms. My post-med school terms, as the doctor I am. Not as the person I was ante-med school.