NorthStar, I don't know you, but there are some things I know about you:

You are an amazing young woman. You are so verbal and express yourself better than many people who are twice your age. This is something you should feel proud about, and it's something that will help you throughout your life.

There is absolutely no reason why you should think that you are inferior to anybody at your school. Bullying is the fault of those who bully, not of the victim. Remember that! All those hateful things the kids say to you, they just amount to "I want to make you feel bad so I can feel better". To say that you shouldn't let them get to you is soooo easy, and actually doing it is much harder. But do remember that all those stupid things they say are made-up, they are not real, they are not actually about you!

It's really great that you have not cut yourself for three weeks. And that you have made your way here and written that very moving post means that you want to get help, and you are able to look for help. That's also great. I can totally understand why you wouldn't want to tell your parents about your depression. (Maybe they would react in a different way from what you think - maybe they wouldn't, it's impossible for us to know, but regardless, I can certainly understand you.) But maybe there's a teacher at school whom you trust, or some kind of school counsellor or a school nurse, that you could turn to? Tell somebody what you have told us here. Ask for advice. And do keep us posted.