I have never been diagnosed with agoraphobia but i can definitely relate to a lot of what you are saying. My husband is extremely outgoing so he pushes me (often to my be met with my tantrums over it lol) to go outside and involve myself with new things and people.
I honestly think if he weren't in my life i would stay home all the time by myself and be ok with that.
I do make an effort every day though, even if it's to the mailbox or the grocery store. And albeit very uncomfortable, i'm making an effort to actually smile and converse with others while i'm out. I"m hoping it gets easier the more i do it.