If you're that young (18??), you can almost definitely afford to quit tomorrow and look for something better.
Never sacrifice your own career for your employer's success (within some time horizon.) Being willing to quit when your boss is a clear bad actor is a core part of this.
It's hard when you're young (no savings, car payment, whatever).. but it gets harder before it gets easier.
This is a time in your life when you're (hopefully) not supporting anyone else, don't have a ton of possessions, don't have a mortgage, can couch-surf, eat ramen, etc.
Never sacrifice your own career for your employer's success (within some time horizon.) Being willing to quit when your boss is a clear bad actor is a core part of this.