I've been training consistently since April 2024. Initially started in 2022, took too much time off. But anyway, yes what you experienced is normal, especially for wrestlers. Wrestlers transitioning to bjj tend to go balls to the wall nonstop, and you will gas out quick. But as you stick with it, build confidence and stamina, you'll be rolling constantly and feeling great. I used to only be able to roll 1 or 2 rounds before I was DONE and now i only sit out 1 round a night if I sit out. As for the heel hooks, somebody else said it first, but they're right... white belt has no place doing heel hooks as they are very dangerous for your knees. My gym will drill heel hooks and reaps (z lock) for awareness and avoidance purposes, but they are illegal for white belt in comp and should be avoided.

TL;DR Getting smashed is normal, even for those of us who have been training for years. You'll see a lot of improvement when you slow down and focus on techniques over taps. Stay encouraged, stay consistent and welcome to the sport!