spotted this before I logged out for the evening.
I hope I can help.
You are NOT an imposter. Having had terrible experiences does not invalidate the good ones and all that you've accomplished.
All of us have countless good and bad experiences, and while we can't change our history, we can change what we focus on. You should celebrate what you've accomplished, not question or negate it.
Remember these lines from Walt Whitman:
Do I contradict myself?
Very well then I contradict myself,
(I am large, I contain multitudes.)
We all contain multitudes.
Including strengths to counter the weaknesses.
From what I know of you from here on DU, you have those strengths. You have a strong family you've made stronger. You have every reason to be proud.
We haven't always agreed on this board, but I'm very glad I've met you.
Sending hugs. 
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