I had a good friend that played D1 and in the NBA
He was the player of the year in the state. I was a solid high school basketball player and could hang with him in HS. He was obviously better. Flash forward 2 years to college and the leap he made was unreal. I then shot around with him when he played for jazz and I couldn't do anything against him just goofing off.
Basketball is their life. They play every day against amazing competition. Most of us after HS, play random pickup games and lower-tier city leagues. Some of you play church ball which is the lowest of the low.