If I do bad on the psat, will i still get things from colleges?

You definitely didn't score well on the PSAT because you checked that box. You didn't really see what the outcome will be. Well now you should expect 'stuff' as you put it in your mail as well as e-mail because you will receive hundreds of them only with information about collages. PS the good ones don't send information to you but you have to find out for yourself.