Many Cheerleader's Goals are to WIN Worlds or Summit. That's a fabulous goal. To achieve that goal, you will want to:
Know HOW to HIT your skills
Know how to Focus attention
Know how to remain Composed
Know you CAN and WILL perform
Know your Plan
When you step onto the floor, are you hoping to HIT or do you know HOW to HIT? Over the next couple of weeks gain this knowledge. Answer each question for each part of your routine and skills.
Once you know HOW to HIT, you will put that knowledge into action. When you take the floor, you will use your Cues.
What will you do when start to get nervous? Do you know how to recognize when you are Distracted and how to Refocus back to your Cues?
Do the work during practice. If you want to be confident, you must train to be confident. You must do the work.
Do you know when you are at your best? Are you excited or relaxed? Know when you are at your Ideal Performance State (IPS) and then create your Plan to a achieve it. You will not be able to force yourself into a mood, but you will be able to create an environment that allows you to reach your IPS.