She keeps delaying marriage for promotions?

We've been together 4 years, and every time I bring up marriage, she says she wants to get married… just after this promotion. Then later, after the next one. First it was Senior Exec, now it's Assistant Manager. I get career is important, but how many rungs we chasing up the ladder before we actually live together? My parents already asking why we're not setting a date. They say in our culture, once you're serious, you plan. But she says I don't understand her ambitions. Maybe I don't... but I do know I'm 32, not some fresh grad. Time passing. She loves me, she says. But actions, right? We're not kids. I proposed last year, she said yes, but now it's all "not yet". Feels like I'm waiting for a finish line that keeps moving... My cousin got married last month. Whole family there, happy. I sat through it smiling but inside... just felt empty lah. Am I asking too much? Or is she using career as an excuse?