THC is a foreign substance to you so your blood is building a barrier. Eventually the barrier will be broken and the high will hit you. Some people get their first time (I did) for some it takes 3 or 4 times. Keep toking, every time you don't get high you're one step closer to getting faded, and your first time getting real stoned should be amazing.

Fuck that resin shit go get some green and hit the bong, much better.