[@BlackRose24]
You'd be invited based on your skills and usefulness in an alien environment. So while capable people are invited onto the craft, their children would be more rigorously trained and educated. People who are invited to cryo-sleep were deemed too valuable to be "wasted" on taking care of the craft and the first generation.

EDIT: In other words, your character has to particularly excel in a skill-set that is applicable to the situation you were supposed to be in. Botanists, doctors, engineers, and a few (FEW)"soldiers".