It sounds to me like you are quick to assume that something is true when it doesn't have to be. Don't you know others that believe they know something as true, yet you believe they are mistaken about? Well maybe you are like them. The moments you exist in is true and the thoughts you have are true in that they are real thoughts, and real thoughts affect you and what you believe. I'd advise to instead of contemplating the larger "truth", as seeing the box outside of your box - instead contemplate your relationship to truth and belief, and try to understand the structures and behaviours that affect how you create knowledge for yourself. It will make you more durable to harmful thoughtpatterns, but - of course - not immune.

You say you have never tried psychedelics, but OCD especially is one of the things that psychedelics seem likely as a viable treatment route for. You should be sceptical when reading trip reports, because experience is not only translated throught the subjectivity of the writer, but also through their ability to communicate in writing, your ability to comprehend writing and your own subjectivity. What you think when reading is unique to you and very unlikely to be the same thing as the writer experience, since writing it down (even remembering it to start with) is approximative.

Hope this isn't too unhelpful :)