I don't want to be a dad. How do I broach the subject at 34?

My (28F) gf and I have been together for 6 years. We live together and our relationship is great, and we both love each other to death. <br><br>We decided to take things to the "next level" 2 years ago, and moved in together. Through all the conversations we've had, I assumed she understood that I didn't want to be a dad. The main thing we've discussed is finances. We have enough to support a child, but it would mean a drastic change in lifestyle. Instead of saving every month, it would be the opposite. We discussed this at length and I specifically mentioned that I never wanted to be a dad. She had agreed that it would be tough and wouldn't be fun. <br><br>Fast forward to last night. We had a conversation about my career taking off and me having a lot of opportunities to take my career to the next level. This would mean me having to travel. Instead of focusing on the travel aspect, she kept hinting at children and how they would be in the way. I asked her what she meant, and she said she wanted to be a mother at 31, as that's how old her mom was when she was born. I tried my best to explain, without hurting her feelings, that I didn't want to be a father. I have no desire to be a dad. I did apologize profusely because I know this is a sensitive topic, and she thanked me for being honest with her, but I can tell she's hurt and disappointed. <br><br>I don't want things to be awkward between us, especially after she gets over the initial shock. How can I approach the subject and make sure we're on the same page?<br><br>TL;DR: I don't want to be a dad. How can I make sure my feelings are heard and communicated correctly?