Want a baby but spouse isn't ready? How are you coping with waiting?

I'm 23 and I've been married for a year. I ready to have children and my husband is not which I understand but we talked about it and he asked me why do I want to have a baby now? Why do I want one so bad?...I can honestly say Idk, well I know why but I can't find the words. It's more of a feeling and I can't shake off. It's glued to me and I can't ignore it. I'm sitting here waiting for when he is ready which will be in about 3-4 years 😞 ( because he knows what best for us, so he say) and I feel like it's so far away but I will wait. I try not to talk about it as much but I get excited when I think about caring for a little person. I just need to find ways of coping with this long wait.