It's sometimes not enough to simply use psychedelics. A lot has to do with the way you use them, with what intention, in what context, with whom, and how you follow up on and integrate your experience.
Plenty (most?) people take psychedelics without any kind of therapeutic or constructive intention -- they take them to party, to escape, as an antidote for boredom, etc. It's not surprising that such use of these powerful substances could have undesirable or even very negative effects -- though sometimes even such arguably reckless use still produces positive results.
Use of psychedelics in therapeutic and healing contexts tends to be very different. The intention tends to be very different, with a focus on healing or on a specific illness, symptom, or problem that the individual suffers from. There is often serious preparation for the journey, ranging from ways of purifying oneself (for psychedelic use in shamanic or other sacred contexts), to sessions of therapy (when this has been done in Western medical contexts).
The actual trips themselves also tend to be handled quite differently in healing/therapeutic contexts from recreational ones. In recreational contexts, people often do it at parties, with the lights on, or maybe watching movies, or maybe sometimes outside in nature. In therapeutic/healing context, the lights tend to be very low or off, sometimes blindfolds are used, and the focus internal. Music is often carefully selected to guide the journey. Sometimes people are asked to look at photos of loved one they've brought with them for this purpose. If things go wrong, trained support is available, and instructions are given on how to the experience in a constructive way, while in recreational settings the support is minimal and usually untrained, if it exists at all.
After the experience, the recreational user is usually on their own in terms of integrating and making sense of the experience, while in medical contexts there are often followup therapy sessions with trained professionals who can help in making sense of and constructively using whatever was uncovered during the trip, and perhaps the scheduling of further experiences with modified dosage, if needed.
I have no idea how your own psychedelic experiences were, but if they were more of the recreational kind, I am not very surprised that you didn't get much out of them.