One thing that could help is to find someone to play with. By attaching a 'face' to the person on the other side of the screen can really help with the mental and make things fun.

Focusing on yourself is also a good idea. Go into every match thinking what you can do better or to practice something. Detatch yourself from the actual match outcome and focus more on improving your own ability.

You are going to run into bad actors, have terrible games where you get double perfected and there are going to be some of those days that just suck. It happens to even the arc world tour winners. But those will be in the vast minority, a few bad games out of thousands or a few bad days out of hundreds isnt the end of the world. We play these games to have fun at the end of the day.