I too used to feel alone and think that the dysfunction in my original family was unusual. One evening at a gathering of friends we were talking about a sit-com and how outlandish the characters and the situation were in the show. Someone commented that "they could never make a sit-com about my family, it would be too unbelievable". One by one, almost everyone at the gathering agreed with that statement. I remember the relief I felt when I heard this conversation. (Up to this event, I had no knowledge of craziness abounding in any of their situations.)
This memory, pre-AH by the way, stuck with me for all these years and I don't recall a similar feeling until I went to Alanon.
Please don't stop giving people the benefit of the doubt, even if you get hurt from time to time. And please give yourself the same benefit. I think the alternative is a hard heart, and I would rather have a heart that stings from time to time than one that feels nothing. (I've been there.)