Curious

I have been working in a daycare for a bout a year and a couple months and me and my boyfriend has been together for 2 and a half years... I have never had baby fever like until about a couple months ago. Im 18 and he is 19. I wanna talk about having children with him but Idk how to go about the situation. We have always said that we wanted children in the future but I kinda want one now and Im scared to tell him. I come to work and take care of other people kids for 9-10 hours a day 6 days a week and Im jealous be cause I want my own.. I just don't know what to do