Its cause your strain has too high THC to CBD ratio
Sativas generally have this. Good indica wont, but has couch lock trade off...
There are good hybrids even classic ones that give you the good grove without knocking you out or making you paranoid
White widow for example great for ppl prone to paranoia or anxiety and still productive
I hear all the new rave for medical non paranoia non couchlock is something like Harley Quinn, 1 to 1 ratio of THC and CBD, kinda weak though less then 10%
But if you prefer something stronger Id go for a bit higher THC, not low CBD either but like a 2:1 ratio or even 3:1 anything more unbalanced will most likely cause paranoia or anxiety
I would recommend classic Bubblegum, its 50/50 indica sativa hybrid, some of the best tasting sweet smoke ever, dont use vaporizer with this you need to taste full flavor trust me. And NO PARANOIA, perfect for going out or going to work and not trippy or speedy like other sativas like haze or dream