You are feeling like this because a variety of reasons I think. I don't know how old are you, but let a 31 year old guy who likes fighting games since the 90s tell you what is happening with gaming nowadays, including fg.
* It is part of our culture and hijacked by capitalism the idea of "competition", and with internet and easy access to play, gaming embraced that.
I'm not saying that this is bad or wrong, I'm saying that everything has its ups and downs and I can assure you that the necessity to prove that your dick is bigger than everybody is causing a lot of problems for our society, including deseases.
* The internet changed everything. Back in time, we played a game for a period, and then there was nothing more to do. Nwe games were coming and the fun was widespread among different games, and the focus was to beat the game, the challenges there, and have fun.
Nowadays, competition took place in gaming and messed up with the experience.
* This is huge and ia related to WB marketing and how publicity manipulates you to get what they want from you.
WB is locking costumes behing competitive modes, towers and shit that the vast majority wouldn't give a glimpse of fuck if they did not oblige you to do it, so, in order to suck everything that they can beyond the price of the game and dlcs, now they are using our addictive instincts, our passion for the game and our flaws as humans....to suck our energy.
And why they would do that?
Simple: The more people are competing, the game is going to live longer, get more repercussion and be relevant.
They don't give a shit about you and their tactics, as long as they receive more and more money from society, they do it.
This is a complex problem related to the system and how the law can't hold companies responsible for their acts, and you can see a lot more related to this when you look at oil companies poluting rivers, the scandals envolving facebook and google....just a few examples.
I just recommend you to stay alert, and understand that probably you are not sonic fox, ninjakilla whatever. If you are supposed to win, you win. It is a talent too....and...don't take the game seriously enough to leave you without peace.
Remember: this is a game and should be treated alike. People giving soooo much importance to compete in a game is a sign of how our society is having some problems that need to be addressed.
Take care of yourself. Your health is your most important priority, and if this is giving you anxiety or if you are getting stressed out, remember that you are not alone and there is no reason whatsoever for you to feel likr that.
Stop playing the game if you need too, or, try what I'm trying to do: Play the game for fun and for your personal growth.
Be in peace and don't let the marketing of wb fuck up your life.