Keys not working

Hello, so I have a macbook, and all of the sudden, my p and down arrow, cap\s lock, and p\slash are all messed up\. when i typ\e a p\, it comes along with the slash, and vice versa. If I p\ush the down arrow, then the cap\s lock turns on, and if I p\ress the cap\s lock, then the p\age will scroll down. My left p\arentheses key isn't working and I don't know what's wrong! Can someone help\ me p\lease????