Most martial arts studios tout that “increased self-confidence” is one of the benefits of learning from them. But properly learning a martial art is one of the most humbling things you can undertake. It takes a while to get to any sort of “confidence.” Beware places that just want to stroke your ego and make you look good in your own mind.
This can be extrapolated to most endeavors and skills. Learning something properly, as a true beginner, requires that you be prepared to look completely foolish.