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

https://tango-wiki.win/index.php/Pre-Session_Routine_Ideas_I_Can_Copy_from_Racing_Drivers

Feeling nervous before a race is normal, but managing it can boost your focus on track. One simple tip is to breathe in for a count of four, then out slowly for six to eight—this calms the mind and body