No one is judging you so don't be shy. Go on the speaker's list, raise your placard in moderated caucuses, and help write resolutions during unmoderated caucuses!
Even if you feel nervous, try not to show it. When you look confident, you can persuade the other delegates better.
Outline what you want to say before you go up to speak during a formal debate (speaker's list) so that you feel more prepared.
Don't wait for others to come and speak to you during an unmoderated caucus. Ask your fellow delegates about their country's views so that you can form a bloc.
Your chairs are there to help make this a good conference, so you can ask them any questions or share any concerns with them.
Negotiate with other delegates, but don't forget your country's core beliefs.