My earliest doubt was when I was a teen, I only wished I had paid closer attention to it. Around 1984 to 1986, I attened the Durant, Okahoma congeration. I was treated like I had something that no one else wanted to catch. The witnesses who belonged to that congeration, treated me like an outsider. I was in high school at the time, and had no friends either in school or in the congeration. I was treated so bad that I actually tried, and nearly succeded in commiting sucide. My own mother had her own problems, with dealing with cancer as well at that time. I was not yet baptized.
Then history repeated itself when I was just married to my husband. I moved to where he was living, and that congeration is Carthage, Missouri. Shorty after I was married, the C.O. and his wife (who was a total bitch) came for their visit. I had briefly met this woman at another congeration, but she did not know that I had just gotten married. Instead of saying what ever, she walked up to me and rudely asked me, "What are you doing here?" Then she went on to say, "You need to quit looking for a single brother and just go back to were you came from." It was at that time my husband heard what was going on, and it pissed him off, and he yelled at her and told her to back the HELL OFF, that is my wife you are speaking to. Yes he actually said those exact words.
While I was attending that congeration I was again treated like an outsider, someone to be avoided.
It was at that point those doubts started to make me think about those people and that religion. They say we are a brotherhood, and talk about love among the brothers.
The final straw was when that same "love" was shown to my son, that was when I decided to research them.