To what do you ascribe this double identity between the online Debby and the real world Debby? I experience much the same bifurcation and in my case I offer the excuse that I'm very introverted.
You know, I spent years of my life, trying to be a friend to various people. Had interests in common, I was an encourager, helpful and made a point of never getting into any controversial discussions (unlike here) , and quite simply it never worked out nor was it reciprocated. I think it was probably because as an introverted person, my efforts were 'felt' to be efforts but not 'real' if you know what I mean. Oh well, I can't help it that, like you, I'm an introvert. I don't feel good with one-to-one in person and large gatherings only provide an opportunity to disappear into the wallpaper. I'm sure from what you've shared here, that you can understand.
Actually, I read an article in HuffPost last week that suggested that there are more introverts in the world than there are extroverts, so we are normal....and they are not

! Golly, that makes me feel so much better.....well maybe not because I'm still left with the same ambivelances. I even had to tell my husband last week that he couldn't phone and make my dentist appointment because 'I needed to do it so that I couldn't let those anxieties take over entirely'! Yep, it extends to phone calls too
When my daughter was a kid, she had a friend named Chelsea who was one of those people that walks into a room full of strangers and within minutes, they were a room full of friends! No lie at all! I used to watch her cruise the room in amazement because even as a child, she just had this glow that drew you to her. Imagine, envying a child for their joy of life and freedom to engage with others!