Whenever I take those myers briggs tests, I typically waffle between extrovert and introvert. That said, I'm a 'listener', so I wind up partaking in various conversations in a room full of people. I have pleasant times and walk away feeling positive and feedback is positive, yet.....yet....deepening the friendships is a rarity. I find that it's human nature to return back to our individual points of origins. Rare is the new made aquaintance one to call and let's go do something. Life gets in the way. Before marriage and children, it was more difficult of a concept for me to grasp and not internalize. Since, I'm content with recognizing that my self worth isn't dependent on whether I've someone to go for coffee with. Perhaps motherhood, for me, negates that once felt ho-hum and loneliness? Another thing is living a relatively sober life adds another dimension to socialization. Relatively for me is typically not accepting that offer for a glass of wine.
That's a piece of such an equation.

I wouldn't, personally, fret over coworkers not adding you to their social clique. That falls into the age old cliche of not mixing business with pleasure. Any friendship worth having is typically forged over time not instantaneous.