What do you want your teacher to know about you?
What do you consider to be the most interesting thing about you?
That's what I would start my paragraph with.
That's using a news writing style, but the good thing about that is that you'll have an interesting "hook" right at the beginning.
Either use an interest you have, something unusual about your life, or--this would be GREAT!--some experience that really shows the kind of person you are. Here's an example:
"Bungee jumping isn't for everyone, but I like the idea of committing myself to a project and then not looking back. That's what gives me satisfaction and the excitement I experience along the way is fun, too. I'm Suzie Student and the other things in my life aren't as exciting as my hobby, but they are very important to me. My family...
Okay, so you don't bungee jump, but what is it that you do? Even sunning yourself alongside a pool makes for a more interesting beginning than. Hello Mrs. English Teacher. I'm Suzie Student. I live with my family. I have a father. I have a mother. I have a sister and a frog.
Good luck in school this year.