I used to be very shy. Not any more. I still don't like crowds, and I prefer to be with one or two people - but I can make a speech for five or five hundred persons, who usually tell afterwards that it was the best part of their day - or the whole week.
What helped:
I went to a course in our university, "confidence as presenter" (bad translation of the name, sorry). The teacher was excellent, and I guess that is what really is what counts.
So, my advice would be: go to some course about communications or such, but make sure that the teacher is excellent.
1) Content needs to be an look interesting for the target audience.
2) Content needs to be fresh and look fresh.
3) Users need to be able to add and enrich the content, in natural way.