It’s okay. You’re going to be okay. Just breathe. Breathe, and remind yourself of all the times in the past you felt this scared. All of the times you felt this anxious and this overwhelmed. All of the times you felt this level of pain.
Successful people are not gifted; they just work hard, then succeed on purpose. This is what hard work gets you, people aren't just born winners they spend every minute of the day working on their dreams and achieving excellence.