Stepping outside your comfort zone is terrifying. I would not leap into anything but get out and do things that you like and if he wants to go fine if he wants to stay home fine. Ask yourself this question "Do I want to spend the rest of my life with this person?" I think you already know the answer to that but need the courage to act upon it and that will come by spending time with other people.
Your trip to California sounds like a nice idea.
Your trip to California sounds like a nice idea.