Feeling nervous before a race is normal, but managing it can boost your focus...

https://tiny-wiki.win/index.php/Why_Do_I_Drive_Worse_When_I_Try_to_Be_Calm%3F_Unpacking_Motorsport_Psychology

Feeling nervous before a race is normal, but managing it can boost your focus on track. Try this breathing trick: breathe in for a count of four, then out slowly for six to eight