Going from extrovert to introvert is what i did a few years back....I still have the charisma, but other people and things distract me from my goals. Wasn't a problem when I was living for myself, but with the kids i have to maintain focus....Other people and their bullshit just gets in the way.....It's why I deal with my lady friend and a couple of smoke buddies just to keep from being a total recluse.
The people I allow around me also desire their personal space and we get along because of that. I don't know what's going on with you right now, and really it's none of my business but there is nothing wrong with being an introvert is it's allowing you to maintain peace of mind.....Now if it's causeing depression, then that's another bag of worms that you have to find the source of, but introvercy isn't inherently bad.