it was probably a combination of low tolerance, a good sativa, and you being anxious before smoking.

set and setting play a major role in your perceptual experience of a drug (more so for strong psychadelics like lsd and shrooms) so the fact that you were basically expecting to have a freaky high made it somewhat of a self fulfilling prophesy.

i say try smoking less weed with a few friends, maybe even have a beer or two before you light up