Sometimes I worry about being a success in a mediocre world.

The line plays on the conventional desire for “success” by questioning the standards that define it. If the surrounding culture is “mediocre”—complacent, conformist, or shallow—then being labeled a success within it may signal accommodation rather than excellence. The worry is not about failing, but about winning at the wrong game: achieving status, money, or approval while losing originality, integrity, or ambition. The quote also carries a satirical edge typical of Tomlin’s public persona, using humor to expose an anxiety many feel in professional life—whether external validation can be trusted as a measure of real worth.