Your gonna make a good Psyker. Bitterness is a big thing for them.
See, there's this little problem the Imperium has: the God Emperor is dead. Or maybe not, they aren't really sure. What they are sure of is that if they don't fuel the Golden Throne, the place where the Emperor resides, then it won't work and they'll lose their nagivational becon. If that happens then the Astropaths can't navigate the whole of the Imperium. The Imperial Guard will be paralized and the Emperor's armies will be unable to move to defend the Imperium, turning one Empire into a million small ones, defenseless against xenos and daemons and heresy.
So, the Golden Throne must be fueled: with the souls of Psykers.
Anyone who displays mental talent is tested to endure the temptation and dangers of the Warp, what Psykers draw power from, the same place daemons come from and the Chaos Gods live. Those who pass come into the serve of the Imperium. Those who fail travel on the Black Ships to Holy Terra to do their greatest duty.
Most fail.
On a military ship the local Psyker Militant would've tested you. And the test ain't nice. Psykers have a special table of side effects, things that happened to them during their testing. You can use that or come up with something of your own. Some Psykers loose all their teeth, some can not longer speak, some have sections of their skull replaced, occationally they go blind in one eye. Somethimes they never nearly fail the test and begin play with a few Madness or Corruption points. Or you can elect to have had an exceptational testing.