overstacking emotional issues

i've got a childhood buddy, he's like a relative to me,
i taught him dota few years ago, i taught everything i know that time since then,
then, we didn't contact each other till lately .
he called me for a dota game. and yes i agreed.
i overestimated him for being a noob, but actually he's better then me.
plus he doesn't the game so often like me,
but still i lose to him. reflect back the time i taught him.
i always thought im better. but, his skills is much better.
i felt numb and speechless . i cant believe i really lose to him.
for something I've done and master so long, I will still lose it.
sigh . I'm overstacking with emoness now. aih.