Why am I really jealous of people that have more than one friend.?
What to do you mean? Why are you so jealous of people that have more than one friend?
Because I have a hard time making friends and I don't have many.
I know you wish you had more friends, but you should go out and try to meet new people. If you take up a hobby that interests you and join a club you could meet new people. It's okay to be envious of her, but don't let it prevent you from enjoying your life.
I have so many hobbies, I have no favorites though so it will be hard to choose.
Well when you decide on one, I am sure it will help you make more friends. And in the meantime it is okay to feel that way about people having more friends.