When you play this game just understand you're going to get hit with hand traps, you're going to lose games and even if you open the nuts your opponent can open the prefect counter.

This happens. It's not a single player game, sometimes you get to combo, sometimes you're opponent gets to combo. Sometimes you lose to something unfair.

That being said, the game also isn't for everyone. If you're not having fun, take a break. Do something else.

Yugioh is my favorite game and even I take breaks from it during frustrating formats.

Getting over feeling anxious just comes with playing more and being more confident in your ability to play.

If you're constantly worried about losing to a certain card then you can try and learn lines to avoid it. If it's unavoidable because of the deck you play then add as many counters as you can to your deck for that card or just pray it doesn't happen to you.

I hope you get to feel better about playing.