You're only 15, you haven't stopped growing/maturing yet. Our looks and bodies constantly change, some people get better looking as the get older, sometimes good looking people get uglier when they get older. To say you are ugly is your opinion of yourself, since we don't know you or know what you look like. Obviously suicide is not (your) the answer.
Not liking your mother is typical of teenagers, most don't like their parents anyway. I have a student who works with me that is (no ****) not a bad looking kid, he's popular, is just fun to have around, and he always complains how he hates his parents. They are too strict, they don't let him hang out with his friends when he wants to, etc. He thinks they are stupid and lame. My mom was a lot like his parents, I didn't like her much at times but now I understand it. Still think she was way too strict but I get it.
There are all these emotions going through you at this age, it's confusing, frustrating, and just a downright miserable time of life sometimes. Some teens take it harder than others, you seem to be one of those teens. Just try to find something to be happy about, something you can enjoy to help pull you out of your negative moods.