Guys, can you give me some advice...

Guys, I tend to get a lot of hate for playing badly in League and other games. But my mental is kinda weak, so it's really tough... I blocked them and managed somehow, but then a stranger sent me a friend request. When I accepted, they started cursing me out with parent insults and all kinds of nasty stuff. Now because of that, I can't even play League. How do you guys handle your mental and deal with this?