After 9 years of dating and a promise to marry

‌We dated happily for 9 years, and earlier this year, we decided to get married. We booked the wedding venue and got the rings made.
We haven't had the formal meeting between our families yet, but we have already introduced each other to our parents.
However, my girlfriend says she lacks confidence about getting married and wants to take some time apart...
She seemed truly happy and excited until the first half of this year,
but I guess the pressure became too much once we started introducing each other to our parents.
I am also quite shaken and caught off guard...
Since I am in my mid-30s, I know I should think about this very carefully, but..
How on earth should I handle this?..
My heart is racing, my blood pressure is rising, I can't focus on work, and I feel like I'm going crazy. Sob.