Brin grew up in Boerne, Texas and attended Samuel V. Champion High School where he played football and track & field.
During high school, he was named first-team Academic All-State and the District 26-5A Offensive MVP as a senior.
During his true freshman season, he was redshirted and played only one game against UConn and completed only one rushing attempt.
During the Week 6 game against Tulane, he threw a 37-yard hail mary pass to JC Santana to tie the score.
[9] He finished the season with playing in 9 out of 12 games while missing three of them due to an injury, completing 148 out of 250 passing attempts for 2,138 yards and 17 touchdowns.