Being bad at something new in front of your friends is a power move most people are too scared to make.

People protect themselves by sticking to what they already do well, which is why a beginner in public is such a rare sight. Letting your friends watch you fumble says you care more about getting good than about looking good, and that is a kind of confidence nobody can argue with. It also makes you much harder to embarrass later.

Pick something you are plainly bad at and do it where they can see: a new sport, a language, singing, a first go at skating. Say up front that you are new, then keep going. Watch how fast the teasing turns into somebody asking to join.