Why do I not get drunk/high?

So I'm young, like young. I'm not an addict, barely smoke or drink but when i do i dont feel the affects at all. I only smoked weed twice and used the same cart so maybe thats the problem but ive druken multiple times and I havent gotten "drunk." Both my parents are light weights so im just confused. My cart is the Half Bake'd pink picaso or smthing like that and i drink whiskey if that matters. When I looked up why I wasnt getting high I was told that could happen you first time but I want to make sure thats true.