I got my patriarchal blessing just before I went on my mission at 22 yrs old. It said I would serve my mission in "one of the four corners of the world." I thought the world was round. I went to the Caribbean Islands.
I received my PB when I was 16. It was a very uncomfortable experience. The patriarch was odd and not at all friendly. The blessing itself was not comforting. One part told me not to be a "flame that consumed and destroyed." I was mostly a good girl so I took that as an insult. It also cautioned, "this, in spite of what has come before, and even because of what has come before." I had no idea what that meant but it seemed that something bad would happen and a lot did after that blessing. When the blessing was over with I about ran out of the Patriarch's house. I was so glad it was over with. I eventually tore up the "blessing." It was more like a cursing.
When I was set apart as a missionary in the MTC I was promised that "my children would call me blessed" and other nice things, none of which happened. No children. No eternal husband. I was a dedicated missionary and did my best. I came home and was a dedicated Mormon, not leaving till I was in my mid 30s. None of those damn promises came true.