Did you smoke it, right? if so, maybe you didn't hold enough your breath. It isn't easy. Or you had too little quantity.
There are people who have more difficulties than others to let go of this reality, but DMT is considered by far the strongest psycothropic substance on earth, so something must have gone wrong for sure. Like, with Salvia Divinorum, especially with the extract, you need some concentration not to loose her, but DMT is not like that. It is a substance naturally present in the brain, and the brain recognizes it immediately.