She doesn't want everyone to always think of her as....
.....a teen mom/someone who got pregnant at 16, and Britney's little sister.
Jamie Lynn said this on her documentary.
It's sad, because those are literally the only two things that most people know her as and think of her.
Like, if you took a poll on the street and asked people, "Who is Jamie Lynn Spears?" almost everyone would say "Britney's sister." If they didn't they might say, "Isn't she the Nickelodeon star who got pregnant at 16?"