Stop with the acting, its just feeds and breeds peer pressure. You son should be himself and you should provide the necessary positive reenforcement for him to be self confident. I told my son be who he is as we are all different and that is what makes life interesting. Have your son join some school clubs or others outside of school, that will create commodery among him and others, go to church or community activities to be part of something. I know being a kid these days is tough but kids havent changed, parents have.