Telling my parents was pretty hard to do....all my life they had expressed their fear that one of their children would have a mental illness (it runs in the family) and as such I had been afraid to "disappoint" them.
When I started getting help, I realized more and more what was going on, and understood my past behaviors a lot better. My doctor recommended that I speak to close friends and family...both as a means of "explaining" why I acted certain ways and as a means of gaining a lifeline: they could never really understand, but could maybe be more receptive.
I went over to my parents house on a weekend (we live hundreds of miles apart). I told them to stay calm and hear me out, and then I told them what my diagnosis was and how I was dealing with it. Once I started explaining, I felt really relieved. No more trying to hide things from the family.
It didn't go over so well though. My mother broke down, cried, yelled, and then blamed my father for faulty genes. My father started crying. To this day they are awkward.
HOWEVER....I am glad I told them, and even knowing what I know now I would tell them again. I don't feel like I need to hide or tip toe around them. I don't have to give excuses anymore. Kind of like the old proverb "the truth will set you free".
I also told some very close friends, who were a lot more receptive. They had seen me being "wild" at parties and engaging in risky behavior, and telling them explained why I acted the ways I did. After I told them we had some long talks...they asked me a lot of questions, and they were somewhat awkward. But, luckily for me, they got over it and now they act like they did before and there is no awkwardness. The only difference is they don't push the issue when I say I don't drink!