My stupid Tae Kwon Do problem...?

If you want to quit, then you should quit. You say you don't want to disappoint some Sr Black Belts but at the same time you say they suck and don't know what they are doing. If you want to quit and not look back then that is what you should do. If later on you find yourself missing taekwondo again try visiting a different studio, you might get different results.