Now or Wait?

I’m so desperate to have a baby and so is my partner but he keeps telling me to wait but I can’t help how I’m feeling I’m trying not to think about it but it’s all I can think about it’s my only wish in life. I have a career I love my job but my dream is to be a mum. He knows how much I want it, I dream a lot about it too, being pregnant/having a baby when I wake up I sometimes cry. How do I get control over this desire? Or should I have a baby now? I’m 22 I know I’m young and need to live my life I would like a couple of holidays first and to be selfish for a little longer but I can’t help feeling like this is my only reason for existence.