Chatman was born on December 5, 2000, and grew up in
Shreveport, Louisiana. He is the youngest of four siblings. He started playing football at age six and showed "incredible" strength from a young age; according to
The Dallas Morning News, he was able to lift in
seventh grade with only "slight difficulty". Chatman also was a top student, compiling a
grade-point average (GPA) of 3.9, and set the school
bench press record of and later . A three-star recruit, he was part of the
Shreveport Times Top 10 list and committed to play
college football for the
SMU Mustangs. ==College career==