But what bothers me is this widely known statement:

Maybe my understanding of comfort is a bit incorrect, but those two situations of comfort contradicts themselves.
I know that statement about stepping out of comfort zone means you should do something eccentric, something that is unlikely to you but being happy about something you have and something you don't have is quite... strange? Also should it make me happy if my bed is my comfort zone and I stick my foot out over the edge? Because it sure doesn't feel any kind of positive.
What I'm trying (and probably failing) to say is our comfort and happiness is our individual business. Either it's having a lovely job or jumping out of a plane with a parachute, it's PERSONAL HAPPINESS. No-one should interfere without your permission. It's you who lives your life, you who lives your happiness! Make it worth it!
Let's stop here so we don't get any deeper and discover Atlantis or something ;)
~your happy-wannabe Weirdode