I do this too, and it has caused the most issues in my life and happiness.
When I was about 16, not dx'd BP though, I had another woman who was like my mentor and I could talk to her about anything. I don't have a bad relationship with my parents, I just don't discuss personal things with them.

Now I have a friend, who stays 600km from me. I've known her for about 3 years, but never met her personally. We chat via mail, sms, Skype... She is also BP and I can really trust her with anything. She is my lifeline.

I have another woman at work, but I think I just smother her. She has a family and a life too, and I've had to take a step back and stay at arms length, for feer of losing a real friendship.

I had a relationship with another woman, and she was my everything. I drove her to end our relationship and eventually even our friendship. It was very hard.

I can talk to my boyfriend, but sometimes I feel that because he's male, he just cannot understand that deep emotional rambling I tend to carry on with.

I then have a few friends who are just that - friends to have a good time with. Most don't know about my BP, and it's easier that way.
I'm 24 and hate relying on other people - one actually cannot reply on others for ones happiness; this is something I need to work on.