So its easy to talk to some but not others?

today i told youth pastor what was going on with me, because for some odd ball reason i trust him, maybe it ws the week in california together we had on the missions trip. or maybe because he was a soilder at one time and knows a little of PTSD. I dunno, But why was i able to trust him and not my own pastor. Is it because 4 years ago he helped me>?? Then why was i able to tell the other husband and wife team that i dont know well, but they work with abuse victims, sooo is that why??? I dont know and dont understand why im able to vent to others and others i just wish they wouldnt press it. Why am i scared of other ppl but yet im not scared of certain ones.???