<human>: Could you distill the essence of the text into 1-3 sentences?

So my girlfriend and I spoke about this at the beginning of our relationship and apparently she wants at least two children. That thought has been troubling me for a while because I have never in my life thought that I would be having children in the future.

Honestly, I hate kids. This girl is the love of my life, we've been together for around 6 years. I love her personality, she's beautiful, and I would never even think of leaving her for another woman. This little conflict in opinion will surely NOT end our relationship, but I certainly fear that might happen.

I don't want children because they might ruin both our future careers(I am worried about the economical consequences), create conflict and very stressful situations, and ruin her (amazing) body. Yes, kids are sometimes fun to have around, but those fun years never last. In my opinion, I think it's just her maternal instinct kicking in... Sure, having children might be an amazing journey or whatever but everyone I know who has had children often look like they regret it, deep down. 

 This might be a recurring problem, but what should I do? How do I tell her how I feel about kids? Will this ruin our relationship? Please Reddit, help me!
<bot>: My girlfriend wants kids and I don't. I want to stay with her for the rest of my life. What do I do?