This describes my leanings as well. I'm in the Tulpa camp. That explanation may also account for many of the other cryptid and UFO sightings.
There seem to be two schools of thought in the inter-dimensionality category as well, with some hypothesizing it in a physical sense. But in the absence of any natural evidence for inter-dimensional travel, I also consider this notion as a product of our consciousness, i.e. psyche. And I will often identify with this category, if the BF question is posed that way.
I don't discount this either. I do think it is possible. But no conclusive evidence that would stand up in a court of law after decades of searching has left me depleted. Patterson-Gimlin film is maybe all there is and it continues to stand mostly because it cannot be conclusively explained as a hoax.