Train 18 - तेरी प्यारी प्यारी Livery को किसी की नज़र न लगे

Hi folks,
Please help me out, I need to know..
If m boarding the train from the very next station other than the boarding point specified.. is my seat still reserved for me or will it get allotted to RAC or wait listed passengers whichever is applicable.. ?
The time distance between the boarding point station and the other station from where...
more...

I am going to board the train is around 2 hours. No stoppages in between officially.
I do not have the option of the change of boarding point as its e-ticket first of all and secondly, I do not have enough time to get going to station in person and place a request for change of boarding here.
Please suggest me with some measure to do so ..
Thank You!