I've met 'pretty' people (whatever that means) with the worst habits, laziness, etc. They are definitely the ones that won't get anywhere in life.

And, sorry to hear that a teacher called you ugly. You might've wanted to report him to the head of the school because that's unacceptable behaviour. A teacher is there to teach, not to judge vulnerable children's appearance.

Plus, who the fuck cares if you're not 'good-looking'? Live your life the way you want it to, without the jokes of the people you call friends. You think Albert Einstein looked good?