I heard that Adolf Hitler was scared of giving speeches.
is this true?
Not really. His first public speech was when he was 30, at a beer hall October 16, 1919 in Munich, and he surprised everyone, including himself, with his frenzied and emotional anti-Semitic speech. For more information, see here: http://www.historyplace.com/worldwar2/riseofhitler/party.htm
If he was, he unfortunately got over it.
Doubt it.... that is how he came to power. By giving speeches.