I had a different view of the world at 18 years old (and I recovered significantly quicker)...
I thought taking a beating meant I had a lot of catching up to do. Especially when they weren't going as hard as I saw them go with each other.
I thought the more beatings in the dojo = far less beatings on the streets.
I thought if they were that good, and I worked just as hard, if not harder, I'd be just as good, if not better by the time I reached their rank.
I had that never give up and keep going forward mentality from wrestling, from which I was only a few months removed.
Bare knuckle sparring with my girlfriend at the time was interesting. She only lasted about 3 months.
Ah, to be young and crazy. To be able to get pounded on and laugh to your training friends in the locker room afterwards and say "did you see what sensei hit me with today?" That's not an exaggeration; we said that regularly. I honestly don't regret a second of it. It builds character.
And the training wasn't THAT harsh.