A lot of us are in the same situation ... you watch TV shows where people have lifelong friends and realize that the WTS took all that from you. The friends you thought you had were just acquaintances who went to the same club and dropped you as soon as they were told to.
That's not what real friends do.
A real friend is the person you can wait to tell some exciting news to or the person you feel comfortable talking to about something that is bothering you. If you can't cry with them or in front of them and still want to see them in future then they are not your friend.
It's easy to make the mistake in this world of throwaway "facebook friends" to imagine that you are failing if you don't have hundreds of people as friends but research has shown that it's impossible to have more than a small handful of true close friends so aim for quality and not quantity.
A good thing to do is practice talking to people. Try striking up a conversation with anyone wherever you are about anything at all. It really does help make you more comfortable talking to people and you never know who you'll hit it off with. Waiting to have your car serviced? Talk to the other people. Talk to the guy who makes your Subway Sandwich or to the waitress who brings you a beer. It's surprising to people who are naturally introverted but people mostly love when you talk to them and the more you do it the better at it you get.
It's a cliche but join a few clubs - people often involve others in their other social activities from other interests. Be open with people - tell them that it's really hard making new friends because you grew up in a cult and everyone you grew up with now shuns you. In my experience people are incredibly sympathetic - just don't be all "Marvin the paranoid android" about it at least initially.