It isn't fair. It's just random genetics that you are the sibling that has a processing issue. Have you gone to the doctor about it? Have you tried to learn more about how it is affecting you socially and what you can do to get help?

If you didn't have the issue, you'd probably be just as socially at ease as your brother. Don't be jealous of him. Why don't you talk to him and your parents about getting you help?