I get the feeling that a lot of infjs go to therapy because we are too sensitive to stressors to be able to deal with an entire *world* that's catered toward all personality types but ours (and I don't believe I'm hyper bowling here). I'd also be willing to say that we're more...receptive to environmental disorders i.e. post traumatic stress, or borderline personality. I personally found that dbt(dialectic behavior therapy) and cognitive therapy worked quite well for me.
I would not go into group therapy. *points to self* Introvert, it would never work. But, with just one person I can be honest and listen honestly. Now, not all my therapists were good. One told me I aught to be bitter, which I *knew* was wrong because I *knew* even then that my bitterness was compounding my problems. Another (same office) wanted to do the memory therapy before working with me on how to *deal* with those memories. 1 month with her, nearly a month of missed uni classes. Then I found two good ones. I may still need more but I'm ok enough now that I can deal and live and the society I'm in seriously shuns any kind of psychiatric help. I've diverged onto me haven't I? Sorry.
Point being, there are good therapists out there, society wasn't made for the sensitive spiritual infjs, I think they probably over medicate us, but sometimes meds are good when they're in moderation, and we shouldn't ever give up.