As the world becomes less & less about face to face socialisation, anxiety about interacting with people we don’t know - even online - will increase… those who use vitriolic response as a defence mechanism in these cases should never be excused.
Communities are an answer, but not the universal one.
But that’s all we have right now.
I try to avoid group content as this is possible. This is a problem sometimes. And i go mad when i need to pug for story content.
Few Times luckly
This is the problem with Blizz hiding new races or story in dungeons/raids. Some people for whatever reason do not want to join groups with random PUGs the majority of which are extremely toxic. Those that say “You gotta earn it ff$ n00b etc” yeah its a game. I have earned the right to play it by paying a subscription. No one “earned the right” to play Draenaei or Worgen did they? Grinding for months to get the required reps is more than enough. As for the story once its completed by enough why not an NPC you can speak to that will show show the cutscenes/story etc?
yes its just you and, don’t forget, its just a computer game.
I probably sound like a broken record by now, but try joining a friendly community.
Horde got: [H] Zen Horde - Chilled PvE Community - #16 by Molson-grim-batol
Alliance have:
I must admit I prefer to do stuff with friends rather than having to PuG. You just don’t know what you are going to get with a PuG.
Having said that, despite my +11 SoB this week being a total disaster, no one raged, or quit. We all stuck it out as we depleted the key and got our loot.
Reduce anxiety by taking control. Start the group yourself, then you have the powah!
I would think that’s the last thing anxious people want to do.
Same as you, but for me i all ways play a healer if someone dies, i just leave out of sheer fear of people asking why i did not heal them etc.
So everything may go nice even close to down a boss, if someone dies i just quit ASAP… 
Never underestimate the stupidity of dps players
Whilst there are cases when it’s clear the healer is bad or undergeared and struggling, there are plenty of times the DPS or Tank does stupid stuff.
Kek, when I get declined I whisp them “Just whisping to ignore you” then copy-paste their character name to my ignore list.
I’m the dps that gets lost, panics and misses all the bosses… not ran any group content in over a year for obvious reasons.
Helped me, but ofc could depend 
Feeling more in control could reduce anxiety. For example there is no rejection aspect if your group. Someone being a jerk? Kick.
If it worked for you it’s a good thing
No harm in people trying ofc!
Never used dating websites, and anyway there’s always another group.
Ignore them. Generally people raging are just looking for other people to blame, so don’t take it personally. If they bother you that much then just leave. We’re there to have fun, so if you can’t do that in your current group then don’t feel bad about bailing.
How are you still alive on the internet?
I suffer from extreme anxiety and depression, ptsd and I was saved by loved ones from suicide attempts.
But this is the internet, it is a cruel place to be, if you dont have a back bone you gonna just be a target for the bullies.
My strategy is that I dont have to care what they think and I dont have to feel emotionally affected by what they say and do. I have absolute freedom on the internet, is why i play WoW. And so do the rest of us, is why they make fun of you.
I suggest therapy so you dont harm yourself further playing the game.
It’s a game dude. Try to relax.
I’m the same. Just got to think, they don’t know you personally, so don’t take it personally, and there’s a lot of people signing up to the groups. As far as they’re concerned you’re just a class and an ilevel.
That’s how I try to think anyway, but I do try and stay away from pugging.