I definitely think it can retard social growth, you have a lot of group-think, you are not allowed to interact with others based on your own personal development and decision making. A lot of child psychologists and developmental psychologists realize how important it is to go through certain stages in your life, in order to form a healthy personality and have friendships and relationships that teach you and allow you to grow.
In a religion such as JW, those types of freedoms are not allowed, everything is pretty controlled, from who you interact with, the friends you choose, how you socialize with "the world". It is an US vs THEM ideology and repression that can do so much damage. A lot of exjws are socially retarded and have to go through the development stages again, many are very introverted, have anger and paranoia issues, have problems making friends, may have hypersexual ideas, in just my very outside observation and limited research, I have seen these reoccuring themes.
That is not to say it has to be like that, I have also seen pretty well adjusted ex jws too, I think it really depends on how your family interpreted the religion in their household and how strict they were, but I will say that I have never heard of a jw that was born and raised in the religion that didn't have any social issues once leaving. I think you will have some and hopefully with friends and support you can overcome it.