It's not unusual to go through the stages of PTSD after leaving a high control group. We can all relate to finding it strange, unusual and at times downright scary adjusting to the real world. The important thing first and foremost is to know that you're not alone. This forum was and still is like therapy to me. Do make sure you visit and read, contribute and post your journey. Maybe even share your story of how you ended up in the religion and how you managed to leave? This can be quite therapeutic.
Take it slow. There's no need to rush. You'll make friends in time if you make sure you get out there. I personally joined classes like art and joined a meetup group on meetup.com. I found a group with the same interests as mine and made lots of friends.
As for self esteem, it's all about how you regard yourself. How do talk to/about yourself? At times we tend to focus on the negatives but there will always be cool things about you. Focus on the things you like about yourself, discover new music and bands that make you feel good. Even re-style yourself. I changed my entire dress sense (for the better!) and i started to feel good about myself.
And, of course, stop reading the Watchtower rags.
I'm only partly qualified (so far) in therapy and counseling so I'll leave it there.