If your casual matches aren’t relaxing it’s because you’re taking it too seriously.

It’s okay to lose. Don’t sit up in your chair when they’re beating you. Don’t switch to your main or sweat build. Let it happen. Your mmr will drop and you’ll get into easier lobbies.

If you’re “working like crazy” you’re forcing yourself into more difficult matches. You’re playing against higher ranked players who are actually taking it casually.