Your screenshots are too small. Get a decent server because it's not even a DDoS but a DoS (https://en.wikipedia.org/wiki/DDOS.)
Forget this kid, there's nothing we can do about it. The only thing YOU can do in the future is to be polite to people and LEARN ENGLISH for a more fluent communication.
Besides, it will be fun for him to see you crying HERE. Try not to amuse the troll/asshole.
Well if you wanted to (like REALLY wanted to), you could collect network traffic logs and report him to his VPS hoster, so he gets suspended for DoSing and loses his server.
But you're probably not going to (I'm being realistic in this assumption).