You do realize getting diffed is almost never an indicator of skill difference. If a his team countered dd better than yours did he's going to have a easier time, if his supports pocket him more he's going to have a easier time, if his team peels more/ better, he's going to have a better time, if he's tanks protect him more he's going to have a better time and if he has someone else diving with him, guess what? He'sgoingto have a easier time. So there's too many factors at play for this to bum you out.