Every time I blaze I get all paranoid and scared?

I only use cannabinoids once every couple weeks, most often using "k2" or "spice" (actually just pure JWH-081(not typo)), but 1/3 of the time using real cannabis. When I do however, once the stone hits me, it hits me like a train and always scares the **** out of me, like I start thinking "I shouldn't be getting high right now, why am I high?" or "What if someone like a cop shows up?" which are of course both paranoid delusions. What can I do to prevent this? How do I get in the right mindset in the first place? I don't exactly go into this thinking the best of thoughts, but I'm not absolutely scared shitless.