Hi thanks for posting this. People who are in pain inflict pain on others. PTSD can rear its ugly head at any time. I use to get angry a lot and yell at people flying off at the handle. I had to see it was trauma related. I felt i had no outlet and i didn't at the time.
Just tell people you have trust issues and don't like people being over friendly cause it triggers issues for you than you are dealing with. And leave it at that. You don't have to explain yourself really but if you were to say i think that should suffice. I wouldn't worry how people take you, just concentrate on yourself. If you feel uneasy at the church then stop going for a while. I found no one is perfect and especially in churches so grin and bear it or change churches.
Just focus on your own well being and what it is that you really want for yourself. you sound fine to me like you belong here with all of us at PC Forum. you are not alone so don't ever fell you are. tc