If the greatest football player in the world is open to advice and assistance when it comes to football, then each and every one of us must accept that we can also benefit from objective advice and counsel (regardless of how good we think we may be) when it comes to public speaking and presentations.
There are a large number of people who suffer from glossophobia (fear of public speaking or of speaking generally); it is not unusual, nor is it something to feel embarrassed or ashamed about.