Anxiety about having children

Good morning ladies.

I don’t know if I’m looking for advice, or just venting. I am 22 years old and almost a year married with my husband. He recently has been talking about babies and how he think we are due perfect age to start having them. I’d always say “yeah! I want babies” but I guess I never thought about it, like seriously. Now, he’s been talking about it more than ever and even is pushing me to start pre-natals. I feel sick to my stomach. A baby isn’t just a baby. It’s sleepless nights. It’s becoming SELFLESS after being selfish your whole life. It a different lifestyle. I’m just scared cause I’ve been with my man, no children for 7 years. We’ve seen with our own eyes couples who we thought would never break up, ending up splitting cause the baby was too much on their relationship. I’m scared that will happen. That we won’t be able to go to bed when we want or sleep in like we do every weekend. Or even the camping trips in the summer we love to take. Ugh. I want a little baby, trust me I do. But I’m so scared to take the leap. What should I do :(