How do you not No. It's not really your fault if you don't know. I feel like probably a lot of society's teach that pretty early on, so many they just assumed that yours did too. You know now though, so next time you'll know.
A motorcycle is the most awesome and amazing ever. It has two wheels, it can move. I bet you'll like it. You could come riding with me if you want, cause you can ride on the back while I drive.