I have Fs

I know how you feel, I have thrown away countless drawings because of a mistake that only I could see, but look, ** it. Do the work as assigned, give it your best effort and turn the ** in and don't give it a **. You don't have to be a straight A student.
A family here harped on their son about his grades, got to maintain that "straight A" status. Report cards came, he got a B in some class, got off the bus, went in his home, went to the gun case, got a shotgun, took his report card and gun into the bathroom and he blew his brains out over a ** B. What a waste of a great kid. So much potential.
Just be yourself, do the work and turn it in. Its okay to color outside of the lines.

Don't sweat the small **..it's close enough for the government.

I know how important this is in the moment. But be comforted in the fact that grades matter so little after you leave school. If it's high school they matter almost nothing as long as you get that diploma, and lemme tell you, they will do ANYTHING to squeeze you out of that school holding that diploma. You do not have to be the 100%-er. Work as hard as you like, but don't overstress yourself. Find time for fun things too. It's alright.