At level 32, I guarantee people will be more helpful than abusive. Its not bad players that players don't like, its ignorant players. If you mess up, you might get people helping, listen to them and show gratitude and that will help your anxiety massively.
I've been tanking since 2.0 and have done all the raids on tank and I remember going into my second Haukke Manor at level 30 and needing one of the DPS to teach me how to use flash.
If that doesn't help, try tanking with people that you know, ease yourself into the comfort of the role before you expose yourself to the duty finder.
