Everything on this website is related to meditation....I think,(maybe not astral projection)
Everybode feels energy in a differrent way so even though i doubt it, its still a valid possibility.
It might be some ability too. Which is more likely.
Try making somebody else have chills. If you can pull it off, then its surely PSI ;)
If you are focusing on one body part and are getting chills, like e.g. your arm, your hands, etc. then it might be you tapping into your abilities of energy manipulation. Anytime you manipulate the energy inside you, you'll feeling heat, coldness, pain, tingling or pressure.