Introvert or Extrovert?

I definitely am an introvert because I think way to much.  I second guess myself constantly and I want to understand why, for everything.  Even things I can't possibly ever know the reason why.  But I also think I have an extrovert hiding inside me.  When I am with my friends I am very chatty and just enjoy being around them.  It's just getting me out, it's getting me to go someplace I am unfamiliar with that is the trick.  I am shy and I do like just sitting at home watching tv, reading and/or hanging out online.  But I also love being around people.  It's a balancing act for me.  When David was alive it was so easy, I didn't need to try and get out I just needed to be with him.  But now I am alone and I don't like being alone but I also really hate trying new things.  True 9 times out of 10 I do enjoy whatever I ended up doing, it's just that fear of the unknown that always makes me want to hold back.