If you speak confidently you will as well be more confident in your work which will result in better results.

Nobody likes the person who is Not confident at all. Yes over -confidence is bad but -confidence is nice and helpful.

The fear of public speaking is the most common phobia ahead of death, spiders, or heights. The National Institute of Mental Health reports that public speaking anxiety, or glossophobia, affects about 73% of the population. ... Public speaking anxiety is considered a social anxiety disorder.