It seems that he may be introverted. Introverts enjoy smaller gatherings and quiet predictable activities.
You may want to change the peers that you wanted to socialite with you and connect with others through your church. You can either start or join a book club.
Set a yard sale and try to befriend some of the people who come around.
Even though he does not want to go out much, let him know that you've gotten tickets to a movie and the he is absolutely going with you. Dress up, do your makeup, and let him know that you intend on going out and he's welcomed to join you. It is ok to do things just the two of you (or you can have your girlfriends and they partners join) so he gets used to the company. See if there are some people he considers close friends and see if they would join.
You may want to plan a cook out and have many other couples join for an outdoors event (pot luck)