Wear Blinders

a.k.a. wear blinkers

to be ignorant or restricted in sight, as if wearing blinkers or blinkers

blinkers are devices use to restrict the sight of horses

You're never gonna be content if you don't try, try to see outside your line
There you go, you did it again!
You act as if there's a blinder on your eyes
-Glass, by incubus

only horses wear blinders, dude