Explanation-
For example, instead of introducing yourself in your class speech and starting in an awkward way, start with a startling statistic. Or start with a summary of your conclusion. Or, you could start the presentation with an inspirational quote. Each of these presentation starters will help you lower your nervousness and decrease your awkwardness. also another thing you could do to not make your self shy infront of people just make eye contact with the people you know it may help you realse some of the stress your having and you may be able to move on with the speech.
hope this helps <3