Rojas is from Fairfax, Virginia, where he attended Fairfax High School, where he was a two-way football player at running back and linebacker.[1] He was team captain in his last two years and was first-team all-region and the region offensive player of the year as a junior in 2021, after running for 1,568 yards and 24 touchdowns.[2] Rojas then ran for 2,239 yards and 35 touchdowns with 72 tackles and 13 sacks as a senior in 2022, being named the All-Metro Offensive Player of the Year.[2] He was invited to the All-American Bowl and was named the Gatorade Virginia Player of the Year.[3][4]
In 2023, as a true freshman, Rojas impressed early and saw immediate playing time with Penn State.[8][9][10][11] In the 2023 Penn State season, he ultimately appeared in 13 games and totaled 22 tackles, 3.5 tackles-for-loss, an interception and a forced fumble.[12]