If the broken stuff stresses you too much you should leave it alone. Make something different. Idk what you are working on but like nice stuff. Healthbars, Particles, Sound, New Art, Expanding content that is already there and works. You don’t have to understand everything in the project, most of the time I don’t understand my own projects. Just don’t let this demotivate you, aren’t you here to have fun. So go and do something fun.
Good Luck and have much fun