Hello. I would like to know, how do you know if you're normal in intelligence, or smart, or brilliant, or genius?

I have many friends calling me smart or brilliant. I guess, in a way, I am. But, I could feel there's something more to me.

Not that I'm saying I'm a genius, but I somehow torn between classifying myself either as a genius or actually "stupid".

I know it sounds weird, well IT IS but, well, just answer my question or else I'll confuse you more than needed.

Thanks.