TIFU by forgetting that a barbell is not weightless.

I started hitting the gym a couple of weeks ago with a friend. We have a specific routine that rotates every visit. One of the workout includes 3 sets of 10 flat barbell presses. Usually my friend reminds me that the bare barbell already weighs 44lbs, but this week he went skiing and I went alone. I checked my gym app and it said that I flat lifted 77 lbs the last time, so I wanted to do 88 lbs this time. I added 2 weights of each 44 lbs on each side... and forgot that the barbell itself already weighs 44 lbs. Instead of going from 77 lbs to 88 lbs, I went from 77 lbs to 132 lbs. The moment I stemmed the barbell out of the bracket, it immediately crashed down on me because I was totally surprised by the weight. I was able to redirect it away from my face and ribcage, but it smashed my pelvis which is green and blue now and hurts like he'll. Luckily, another gym goer saw my struggle and helped me out of my misery.

TL;DR: Forgot that a barbell isn't weightless, accidentally almost doubled my weight and nearly crushed my ribcage.