If been there and somehow still am. Like u said ur always the person people can relay on and the more responsible one. I always think things through before i do them, which really is just ruining all the fun, my Head is working all day long and there are just a few moments where i just be myself and have fun without thinking.
I dont drink but come to thinking, maybe this will help to let myself be more outgoing, but then i dont want to start something i keept my hand off for so long and im scared that i might like the drunk me more...
Guess all thats keeping u from being happy is ur Head. I havent figured out how to let myself go again, tho im looking for a psychiatrist at the moment