Galaxy Quest- It clicks on multiple story levels, as a comedy, a sci-fi, a great parody, a story with heart... but the biggest reason is Crewman Number Six. Guy Fleegman, the expendable crewman, the obligatory "red shirt" who must die early in the show to prove how serious the situation is.
In Galaxy Quest, Guy beat the odds. He survived, was re-designated as the plucky sidekick, given a last name, and became Security Chief on the ship. (I know, I know, Tasha Yar... still, his odds of surviving are much higher as an accredited cast member.)
I take inspiration from Crewman6. If he can buck the odds and succeed, then anybody, including me, can do the same.