TBH i wouldn't change that experience for anything. During my early 20s, like you, i was working at a startup and had super high workload. Definitely burned ou

TBH i wouldn't change that experience for anything. During my early 20s, like you, i was working at a startup and had super high workload. Definitely burned out a few times but the motivation was high and i enjoyed every minute of it. It pushed me beyond my limits and i learned so much in a very short time period. Now, i'm closer to my 30s i don't think i could do this again. But with time comes wisdom and instead of high energy/high workload i choose to work smart/not hard.