Look, bad grades are just that: grades. When you're out of high school, you realize how much bull ***** it all was.
You could be different, but a large part of my sudden failings had to do with my mental illnesses; one of those being depression. Your mental health is by far your most prominent concern. Who knows, if you get the help you need for your depression, maybe those grades will improve.
You're life's not over, it's just beginning.