My Fiance Wants To Get A Sperm Donor..

So me and my fiance talked about having a baby... Today she told me she wants to get a Sperm Donor. I asked why. She said because she wants the baby to be attractive... She wants someone who looks like her. I'm chubby with brown hair and hazel eyes. She's skinny blonde and has blue eyes. She said she loves me but our baby deserves to be attractive.... I feel really insecure now.