I think the same thing happend to me man. The first time i smoked i didnt feel really high but I could defenitely tell something was different. I only remember like bits of it but my friends tell me I was fucked outta my mind. I think that people do get high their first time its just that they dont know how to perceive it so they think they are not high. And then they forget the whole thing so they dont remember what it feels like.

Also, I know people that took like 5 times before they got high. Myself, the second time I smoked, I knew i was high.

So, the first time you get high, you will know.