Cases can sometimes be a puzzle. I hope it's not too bad. At least you found the cause. I think I would rather have a little crack in my case and access to the front/top USB ports.
I know this sounds like BS, but you learned to take more time and use less force. Lord knows how much stuff I have broken over the years, and every time I do, I learn not to do it in similar circumstances. Everyone has done it just move on. It's like the first scratch on a new car, don't let it get you down.