I am a confident person.
But I think you have to believe in yourself to be confident. Sounds daft

. Why, for example is public speaking a horror for so many people? To many nervous people to gain confidence they will have several drinks or other drugs of their choice and make a complete cats bum of themselves. They will be remembered for years. They will never be confident to talk in public.
So how do you do that?
If public speaking is your aim, practice. Buy a full length mirror, stand in front of it and talk. Have your Dictaphone whatever on and listen to your self.
If you look like a tart in high heels, slut make up and too low a blouse, guess what? Everyone in the audience will know as well. If you look like a well dressed person who is nervous; guess what? everyone in the audience will know and hang on every word.
Confidence is finding the beauty inside you. And I do not mean any trivialising of emotion of common sense. But we sometimes forget that I am the important one. I matter. I am the one who needs to grow and flourish.
The other thing about self confidence is every step is a step.
I've been teaching Hons and PhD students for the last 20 years. I love it. It is a privilege given to few, and an honour I do not deserve.
But each year the newbie arrives, OK this is the project and we will work the details as we advance. I want you to present your project to the group in two weeks time. I want a ten minute talk. I can't do that is the usual reply. Never had a failure.
Cindy