Wear a helmet, and have a good day at school.

Biking is life. - signed A Dutch guy.

Hell yeah! Get it, fam. And yeah, try not to be annoying about it, but don't be shy about it, either: the more people know someone personally who bikes to places, the more every cyclist on the road gets humanized in the mind of the average driver. It makes all of us safer to talk about bike commuting.

Here in Portland we have the bike bus. It recently got enough attention that the state legislature passed a bill allowing schools to use transportation funding to promote/organize their own.

Just got my bike back from shop for a hefty maintenance. A lot had to be done and couple of parts had to be changed. At the end it costed me just 50€. If this was a car with a similar maintenance, it would have been at least couple of hundred, if not even close to a 1k€. Bikes are awesome.

You should mention what part of the world you live in. Western/northern Europe is paradise for cyclists compared to USA, for example

Hard not to talk about it when it is 100% the best way to start your day.

IDK what the culture is like at your school, but if you're feeling motivated consider offering to organize a group ride to school to encourage others to join in. It could just start out as a one-time or once a month thing and increase from there if there's enough interest.

You just need biking buddies to talk about it with. Maybe you can start riding with some of your school mates.

What is the 'cycling stereotype'?

Good on you, buddy. When you say they don't talk about it, do you mean among each other or with others? If the former, maybe you could use questions about bike maintenance as a way to start the conversation?