I Have Two Friends And They Seam To Leave Me Out, What To Do?

This reminds me a joke of Alexander Graham Bell (person who invented telephone). After invention, he had nobody to talk to. So what he did he gave one phone set to his friend for conversation. But when he got bored talking only with him, he decided to give one more set to his other friend. After few days, Alexander gets an engage message whenever he calls to his friends. You guessed that right, they both were talking with each other all the time.
You seems to me in beginning of your teenage life. In this period of life, relationship jealousy is very common. In your case, its friendship triangle. You need to realize that its only friendship. Don't take it too serious. If Amanda listens to your other friend, then its her choice and you can't force to follow your will. Live and let live. If all three of you can't spend time happily together, then its better for you to continue friendship with anyone of them whom you feel more tilted towards. Seems that you like Amanda as compared to your other friend.
Don't take it too serious, its not a matter of life and death.

Best wishes

You should arrange a meeting with both of your friends together. And then you should talk out these things. You should tell each of them how much they mean to you. And what are the problems you're getting if they will leave you and how much you respect them. So they should not behave like this. For further information you can read the book by Anthony Robbins named "Awaken the Giant Within".