OK. Let's make this simple. Grammar is not my best subject, I don't even like it that much. My mother is constantly correcting me. Heck, I don't even proofread my own writing! But let's be honest here, we're all adults (or almost) and we should know the basics. Here, I'll give you a little grammar lesson.
Your: the most commonly misused word (according to yours truly).
Remember when we learned You're in elementary? Yes, it's a contraction.
(p.s. "what" is not a contraction in case anyone is wondering. There is no such thing as "wh'at")
You're replaces "You are", you see? Now let's practice.
You're a really cool person.
You're out of your mind!
You're driving me crazy!
I know this is a new concept for some of you, but please try and comprehend it. It's really not that hard!