I'm a girl and thirteen and I can't ever sleep it takes me 1-2 to fall asleep and I wake up 1-2 hours later most of the time and can't fall back asleep I also have to take naps and I don't think I should be !

Also if there are any doctors that see this please say that you are a doctor and I you are a doctor please tell me what to do I want sleep!

Hi, and welcome to the site. Please ask all your questions in one post.
Because you are only 13, we can't begin to offer medical advice. Why haven't your parents taken you to a doctor recently? Have you told them what's going on?
I had insomnia when I was a teen. I felt like I got no sleep at all! I did nothing about it, which might be because it was over 50 years ago. I worried, I guess. There are countless ways to help you sleep that don't need a doctor, and at your age, I would Google 'how to fall asleep' and 'insomnia' to get tons of advice that is already written in detail.
Your knee could be one of several things, so you could need an MRI.