I've never told you this, but I've been living a double life. I think it's catching up with me though.
I never would have guessed that! Why is your double life catching up with you?
It's difficult to try to be two people, I'm starting to make mistakes.
Regardless of your character flaws, it's just better to be yourself. It's wrong to lie and deceive others about your personality.
If my family knew what I was really like, they would be ashamed of me.
It sounds like this has really been weighing on your conscience.  You should be honest with your loved ones and tell them the truth. They deserve to know and you'll feel better when you come clean with them.