I'm just like a radio

I'm just like a radio,

It's difficult to find the frequency that you want,

But once you get it,

You'll get to know everything.

I'm just like a radio,

You need to know the frequency that you want,

Or else,

You wouldn't even be able to find it in the first place.

What you see is not entirely what lies beneath. So, please don't assume that you know me until you really get to know me.