I found this was more the case early on into quitting. The author's advice of pushing through the discomfort and saying what you wish you could is perfect. It really helps ratchet up a social engagement into gear. After a while you get used to just speaking your mind, more earnestly than ever before in my case.
Keep it up and you'll be laughing and crying in the pub's booth just like old times, walking home tired and wobbly from oversharing. Yes you'll even cringe at your inability to keep your big mouth closed.