No one likes feeling fear. But feeling fear is absolutely normal. It’s even a positive thing because it shows that you care and you want to do well.
Keeping the attention is the most important task for every public speaker. Why? Because trying to be understood without attention would be like trying to fill up a bottle with the lid on.
We all know the importance of eye contact in communicating with others. But how can you look at a large audience and get the full attention with two eyes only?