I think Givelove said it well...that sense of loss of the old self and lifestyle does tend to creep up and suddenly you realize.
Naranon meetings helped me to find a place where people understood and where i could get used to focusing on me for an hour and not on my addict. That was a good start to opening up and letting one or two people I trusted into my world...Little by little I regained my sense of self. For me, I found letting go of a feeling of being a victim of circumstance and working to gain control back over what I could control...me, was helpful in breaking down the walls I put up to keep the rest of the world out.
I hope you can find a way that works for you to get back a little of your connection with those you have lost touch with. The first steps are the most difficult