Because in order to activate the THC, you need to decarboxylase it. Essentially, heat it up. That's what's happening when you smoke or vape it. I don't know if you still partake but if so, next time bake it in the oven for a while, or even the microwave (look it up to do it the proper way). You should be able to get fucked up on just a little bit of keef, not the whole lot you saved up.