If you can't think of what to write, tough luck; write anyway. If you can think of lots more when you've finished the three pages, don't write it; it'll be that much easier to get going next day.
Whoever has the luck to be born a character can laugh even at death. Because a character will never die! A man will die, a writer, the instrument of creation: but what he has created will never die!
So, it takes a lot of chance and luck. I mean I was lucky enough to get in the program where people with the same skills never made it to the program. So keep trying.
I think there are a lot of technocrats in the business who would much rather work with just wheels and gears and machinery. Those things interest them more than humanity and I wish them the best of luck.