Hello, I am also an INTJ. I understand what you are saying, and unfortunately that's just the nature of therapy. And sadly it's the nature of most things really. You could see a psychiatrist and get medication, that is a kind of "science", but even then it's a crapshoot if and how that medicine will work for you.

I've decided that the best thing about being an INTJ is our ability to be objectively open minded, and that we will change our "opinions" to honor what is true above all else. Keep this in mind when you approach therapy, take the mental stance that you are investigating. You are after all! Whose advice ever would you just take on its face? And as you investigate, continue to remind yourself these two things 1) as an INTJ these emotionally subjective discussions with your therapist are going to be awkward and out of your comfort/experience zone and will not be easy and intrinsically you will want to run from them 2) respect that many millions have studied these subjects, it is not all hokey BS, people have poured their entire lives to studying counseling theory etc.

Probably the biggest challenge you'll face is finding the right therapist. It took me quite some time. The trust thing you're talking about is exactly why, you do need to trust the person to a large extent. For it to work, ideally you want to find a person you think with a decent amount of confidence can help you and knows more than you. Very likely this will be a person much older than yourself and one with multiple decades of experience. It sounds like the therapist you have now unfortunately is not that one for you. Just remember, therapy is talking to a person for an hour. Who that person is makes literally all of the difference in how your therapy hour goes. I've been very fortunate to find a therapist who I think is extremely intelligent and that I trust. He wouldn't try to prove the validity of anything to me, I'm not sure how he does it actually but all of the conclusions I've drawn in therapy have been on my own, I've not been talked into believing anything.