You’ll quickly build a sense of confidence and be excited about your results. Work will become a 9-5 means to an end and all the weird stresses will wash over you because you feel good. You’ll look forward to waking up at 6am and going for a 10 mile run and will go to sleep early in anticipation.
After awhile, you’ll look at the people above you in the soulless corporation and realize they’ve wasted their 20s/30s climbing an arbitrary layer. I remember going into my first job at Amazon and calling my girlfriend, telling her “These are the richest, most miserable looking people I’ve ever seen”. I looked at the folks that were $SDE+2 and they were doing the same work, they just artificially cared more and would spend their evenings and weekends working.
If you don’t have kids then you’re lucky, you have more time to spend building yourself up.
I guarantee this will work but there is a really rough 1-3 month period before it kicks in.
Start today: do 100 pushups, 100 sit-ups and go run-walk for 20 minutes. Do that everyday, continuing to set goals. Rain or shine. Even when you feel sick, hungry, tired.