I don't know what I'm supposed to do.

My boyfriend and I have been together for nearly 5 years. He's 32 and and I'm 28. I've been longing to get engaged and married, and have a baby. He always gets annoyed when I bug him about marriage and tells me our time will come, and I trust him. Yesterday we had a 4 hour conversation and he completely blindsided me by saying he would like if we started to try and have a baby (hence why I joined this app). My question is: should I want a marriage before a baby? I've wanted to be a mother for as long as I can remember. Every bone in my body is maternal. Why do I feel panicked now? I am almost freaking out at the thought of having a child even though I know how much I want one. I just need clarity from people who can understand the nervousness.