It is always like this?

Does the opposite sex (or same sex if that is your preference) always hold this kind of power over you?  I mean, jesus!  Kostya emailed me on saturday, asking if I wanted to do something.  I replied yes.  Its monday night and he hasn't responded.  But this is not the crux of the issue.  Its me.  It has been two days, barely over 48 hours, and I'm getting all nervous.  I shouldn't be.  There is nothing to indicate that this is more than a friendly get together.  And yet I'm spazzing out over this.  This can't be a good sign.  I mean, I already have anxiety about this, so it can't be good.  Or maybe I should just not even bother with this romance stuff.  So far, all its done is give me stomach aches, and thats before the dating starts.