As others have stated, you will never forget this moment. Just as you will never forget the first code you do when you actually perform compressions and feel the ribs give beneath your hands.
For right now, give yourself time to process it. It is very normal to feel overwhelmed and stunned. As another stated, it is nothing like what Hollywood does such dandy job of portraying.
People forget that it is not simple, or easy, or clean.
It is work.
Literally. Think about it. You are acting as both of the most overworked muscles of the body: heart and diaphragm. You are forcing blood through literal miles (aprox. 60,000) of vessels and doing so through layers of muscle, fat, bone with nothing but the heels of your hands sweat, adrenaline and drive. All while keeping the same beat as the song "Stayin' Alive".
It is back breaking, arm numbing, and taxing. And mentally, it can wear you down.
I don't know if it necessarily gets easier so much as you learn to filter, to file and to process later. Not so much numb as, perhaps, more detached? And some days it really does feel more like, oh for pity's sake, here we go again. And some days, it takes your breath away.
Give yourself time to process. Cry if you need to. Vent. Talk. Move forward.
As I have said to others, my door is always open, should you need to chat.