Quit for your own sake. You could go back on day if you ever really wanted, but it sounds like you don’t want to. Don’t worry about the repercussions now, you need some help. Therapy is a must for you right now. Other jobs can pay decent and you’ll get by and you won’t feel bad. Teaching is definitely not for everyone, and most people first response when you say you yeah is to tell you that they never could. You’re not doing the kids or yourself any favors by staying, and it’s better for everyone if you quit now than if you quit in a month. If you feel guilt, tell your boss the truth, and try to stay as long as possible until they can find a replacement.