when i was boxing and scared of sparring with people,i offered the best in the gym a sparring session and told him not to hold back,i got my arse kicked but for the rest of my time in the gym i wasnt scared of anybody and trained with my full potential

Thats good advice man

When I used to be worried about sparring I would go into ultra confident mode and start saying to myself that whoever got in the ring was in for a hard night. Now they are.