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This is by no means an official answer. I am no expert on X-plane. Just a novice like you learning from the problems of other flight simmers.
What I understand is that starting at the end of the runway is the standard default situation for x-plane 10.
Having read most of the postings in this Q&A forum there are others who have experienced the same problem of starting at the end of the runway instead of at the gate. At the moment I can't find the posting(s) to point you in that direction.
From memory and apart from reading the manual (page number ?) my understanding is Start X-plane then go to Settings then Operations and Warnings and then Startup then tick the appropriate box.
Hope this helps.
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