Why won't my laptop keyboard work properly?

For the longest time now, after a while of being on the computer my Lenovo V450 V550 series laptop keyboard just messes up. Every letter I type is capitalized and I can't use shift without these weird numbers popping up instead. It's driving me crazy because when it does this I can't get into my email or anything. I turned off sticky keys so idk how to fix this. Please help before I take a hammer to my computer