It's been a looong time ago, but there are still some memories.
There were plenty of regrets and missed opportunities because of being a JW. I wasn't treated terribly bad, but it was enough that I saw 'the world' as a rough and unpleasant place. Unfortunately, it moved me more toward WT, the conditional JW friends, and the hope of the destruction of the 'wicked world' "very soon now"... back in the 70s, then the 80s. Then I made 'spiritual advancement' and went to bethel. Ugh.
Over time, I've tried to put a positive spin on things. During those school years, I focused on studying (rather than having the right friends, the right clothes, the right extra-curricular activities) and was a very good student. Although I didn't get to go on to "higher education" then, I always valued learning and now have my degree.
I also came from a small rural school system. Although some of my classmates kept in touch with each other and have stayed friends all these years. The majority of us went our different ways and didn't reconnect in any way until Facebook came along. In some sense, I don't feel it's just a matter of not having friends in school because I was a JW. I feel that the JW 'friends' I grew up with were superficial and not real friends.