Ask HN: How do I stop focusing on competition, and focus on my own improvement?

Recently, I was accepted into attending a hackathon. I have never been to any hackathon before, and I feel a little anxious. I feel that it's all about competition, and instead of me learning and programming new things, I will rather be undermined by others who are smarter than me. I feel that people will criticize my ideas because they see me as a rookie in programming. How can I forget about the competition aspect, and focus on improving my own programming skills?