Am I a defective woman?

Lately my partner has been challenging my views on gender roles and such, and it came up that he when he plans to settle down and have kids he wants the wife to be a stay at home mom. This hit me like a wall of bricks, because everything I've done in this life is building up to a career and the idea of dropping all of that on his whim. I could just see him coming home with projects and being envious because that's how I'd always pictured my life would be going... I've also looked more into it and it feels like I'm in the miniority- there are so many women who would kill to be a stay-at-home mom.
Am I defective? Is there something wrong with me? This has actually made me cry over the past couple weeks and I don't know what to do. It makes me feel like less of a woman.