Self started racing at age eleven in go-karts. He switched to open-wheel cars five years later and came to stock cars at age eighteen.
K&N Pro Series West
In 2009, Self ran two races with Motorway Motorsports, starting and parking. After going full-time with Motorway in 2010, Self was signed by the Golden Gate Racing Team, an affiliate of Richard Childress Racing, for the final two races of the season. The partnership with GGRT extended into 2011, with Self driving top-tier equipment. However, there were missteps, like a crash in Sonoma qualifying that relegated him to the back of the field. With a car that his crew chief described as "winning", Self worked his way through the field using his car and crashed again, finishing 25th. He finished seventh in points with three top fives. The following year, Self broke out, winning three races and only finishing out of the top ten six times in a fifteen race season. He improved to sixth in points. In 2013, Self won three races in a row and never fell out of the top six in points to finish fourth. Despite the six wins, Self did not return to the RCR driver development lineup in 2014. In 2017, Self returned in a part-time capacity for Sunrise Ford Racing. He ran the full schedule except for the season opening race. He won the race at Meridian Speedway after Chris Eggleston was disqualified for jumping the final restart. He finished in the top ten in all of his starts and won another race, at All American Speedway.
ARCA Menards Series
With no ride in the K&N Pro Series West, Self joined Venturini Motorsports for two ARCA Racing Seriesevents in 2014, the first at Mobile International Speedway. He failed to finish either of his starts due to mechanical issues. Again without a ride in any national series, Self partnered with Ranier Racing for a race at Kansas Speedway in 2016, in which he finished third. He spotted for Justin Haley in 2015 and 2016 at various races. In January 2017, Self and Ranier announced that they would partner for the season-opening race at Daytona International Speedway. With Ranier giving up ARCA operations to MDM Motorsports, Self ran the scheduled Ranier races in the MDM 28 car. After running inside the top ten at Daytona, Sinclair Oil Corporation added more races with Self in both the ARCA series and K&N Series with MDM and Mason Mitchell Motorsports on the ARCA side and Sunrise Ford Racing on the NASCAR side. Self finished inside the top five in three of his next four races before he won the season finale at Kansas Speedway, beating out Ty Majeski in a five-wide race after the final restart. Self gave the credit to his spotter Derek Kneeland, who at that point was the spotter for Monster Energy NASCAR Cup Series driver Kyle Larson. On January 8, 2018, it was announced that Self and Sinclair partnered with Venturini Motorsports for half of the 2018 ARCA Racing Series schedule. The schedule includes races at Daytona, Nashville, Talladega, Charlotte, Michigan, Chicagoland, Lucas Oil Raceway, Salem and Kansas. Both driver and sponsor had previous experience with Venturini. Self had raced with the team in ARCA and the Venturini family had operated Sinclair gas stations. Self began the 2018 ARCA season by winning the season-opening Lucas Oil 200 at Daytona. He followed up with a win at Chicagoland in late June, avenging a near-loss in the 2017 edition of the event. Self beat Riley Herbst and Sheldon Creed on the final restart to secure the victory. At Salem Speedway in fall, Self and Zane Smith got in a racing incident early in the race, leading Smith to retaliate by intentionally destroying Self's car later in the race. Smith was later penalized by ARCA for the incident. On January 11, 2019, Self and Venturini announced a full schedule for the 2019 ARCA Menards Series season in the team's No. 25 entry. He won the series' first trip to Five Flags Speedway since 1996 in March, outlasting Kaden Honeycutt and Ty Gibbs during the final green-flag run. He followed that up with a win in the season's third race at Salem Speedway after rain arrived after 101 of 200 laps, ultimately handing him the win. At Charlotte Motor Speedway in May, Self won the pole, led the most laps and at one point had over a 10-second advantage over the field, but slapped the wall in the closing portion of the race and faded to fifth. He continued his tear in the front half of the season by leading 85 or 100 laps and winning at Michigan International Speedway in June, but was penalized after the race, keeping his points lead small. At the Allen Crowe 100, Self claimed his first dirt triumph, beating Venturini teammate Christian Eckes on a late restart. Late-season mechanical failures and a lack of restart speed in the season finale at Kansas Speedway, dropping Self to second in the season-long points tally behind Eckes. After originally only securing enough funding for a partial season, Self returned full-time to Venturini Motorsports in 2020. He began the season by winning the Lucas Oil 200 at Daytona.
Self made his first Xfinity Series start in 2015, replacing Landon Cassill at Iowa Speedway in JD Motorsports' No. 01 entry. In doing so, Self became the first driver from Utah to compete in a NASCAR national series. After crashing in his first start, Self ran six other races for JD, culminating in an eleventh place finish at Road America driving the No. 4.
