My mom started studying with JWs when I was about 5, so while I am not a 'born in', I was indoctrinated early on.
Socially, yeah. I was stunted as a kiddo - even into my mid-20's to early 30's.
But, a lot of the social inactivity may be due to my mom, not the JWs. I was never allowed to associate with other kiddos my age. (Actually 'never' may be too strong - let's say 'almost never'.) No friends allowed over to visit. No going and spending time with friends at their house. No sleepovers. Etc.
As a teenager, of course, I was not allowed to have interactions with other teens. In grade school, I learned how to become 'invisible', so others never saw much of me. (I went to the same school as my ex-wife, who commented one time that she never saw me in High School. I just grinned.)
No dating, or even talking to girls. I know of several girls that were in the same classes I was, that probably were wanting me to... befriend? them, or ask them out. (When I was older and able to ask a girl out... rejection was a strong fear, that kept me from asking out a few gals.)
Like others mentioned, I too, was never commended for accomplishments. I was required to bring home good grades (A's or B's), or else I had better have a good explanation why I wasn't.
If I did something unusually great, I got no 'attaboys'. No recognition. No 'Senior Honors Night', where I was to receive an award. No graduation exercise.
I think all of this 'negativity' had an affect on me (how could it not?). I kept to myself a lot, not interacting with others. If I devised some sort of unusual contraption, I felt it was no big deal.
When I was single and living on my own, I took ballroom dance lessons at a studio. While I don't think I was that good, the instructor told me that I was... but I think that they are supposed to say that.
I know that when growing up, the local KH 'in charge' people were very against things like parties. They shut down my mom, when she tried to sponsor some 'square dance' parties. Can't have the peons socializing or having fun, ya know.
Currently, as an adult, I do not think that I am an expert at socializing, but am able to mingle okay, if I choose to. I've seen others, who were never a JW, who are more awkward than I am in social situations, so I do not feel too bad about my own inadequacies.
Regards,
Jim TX