Theories differ about where mental illness comes from, and the truth probably is, it differs for different people. In your case, the important thing I think is to talk to a psychologist to at least get a diagnosis. It could be you're just worrying about being 16 years old, which is to say, we're all pretty weird at that age, but for most people it's an amusing weird. You're not happy with these things, and it can only help to see what's up. What you're describing can be your personality at a small point in time, it could be exaggerating things because something's going on, and it could be depression. Whatever it is, I think you'd be eased by talking to someone about it who understands and who can determine if it's something more. I think it's time to have a good long talk with your Mom, but I wouldn't go into any panic about this, teenage years are just weird for everyone from time to time and hopefully that's all it is. Any idea why your Mom is so averse to the idea of treatment? Ask her if she'd feel the same if you had a broken leg.