Talk to your coach. They'll know you better than random guys on the Internet. I take it you're nervous... This is perfectly normal. It's better to be nervous and cautious rather than cocky and reckless. Make sure you're in good shape both aerobically and anaerobically because boxing is a bit of both

Everyone gets nervous but just remember this. It's only you and one other guy in that ring. One will come out a victor and have a happy day and the other one will be a loser. If you lose don't get discouraged just use that anger and power to become stronger and next time you can beat him. Also if you've been training harder than he has then you got the fight in the bag. No one is gifted the ability to fight.

Put some knockout gas on your gloves and stick it in his face, he'll just fall over before to long.

Hit them but don't let them hit you