I was a born-in with 90 percent of my family in the organization, I also left when I was 31. I am 38 now-how time flies! I did go to college- got my masters degree, it took me 6 years. I remember now those early days- most everything made me uncomfortable, and every decision felt like an exhausting process.
It took me about 3 years to make any friends, other posters are right when they say that just a few good friends is enough (we are used to having scores of "friends"...but you quickly realize that these friends at the Kingdom Hall were conditional relationships).
It takes time when you are an adult to make friends because we are all so busy, and it is true that many adults already have a circle of friends they've been hanging out with since they were young. In my case, I had to start to cultivate my own interests first before making friends...as a Jdub we were never able to have many hobbies or find our passions- so I had to take the first step of finding out who I really was...then find people who share my passions. Going to college made that part easy- so my first friends were those with the same major as me.
Then when I got out of college I had to move across the country to find work. I started over in a new community- the friend finding process had to start all over again. I had to force myself to do things in the community to meet people (this is hard to do since I am a bit reserved)...eventually it took about 9-10 months for me to find a few people who were interesting to hang out with. Now I am moving again for a new job....it starts over again. I think I have gotten used to being a loner, I still have a hard time in social situations... and maybe I always will.
The friends I have made along the way...I keep up with on Facebook, that helps when I am lonely in a new place. I try to find exJW groups on meetup where ever I move- I have been to a few exJW meetups, I always find them helpful...to talk in person to others who get where I am coming from.
So my point is...it can be a hard road, but now that it has been 7 years- things have gotten much easier...I know myself- and it is much easier for me to evaluate people to choose who I want to spend time with...instead of having a congregation full of "friends" who in reality you don't really share much in common with and lets face it...many of them bug the shit out of you. I wish you the best of luck-