My boyfriend doesn't want to be engaged or have any kids for a few years.

We are young but I just feel as he don't want those things with me and it's making me go crazy all over again! I've told him multiple times if he doesn't love me then just tell me and he will always say he loves me but sometimes I just don't think he does because I'm having a hard time understanding why he doesn't want it right now. I'm 18 and he's 20 and he works at a airport and will be doing his PEAR test to be a Police Officer is January. I want to be engaged to him and all I can think of is having a family with him! We've been together for 3 years and this is probably the most stupid post some of you glow users will see but I'm sure some of you may be able to relate.. He was working at a job before where he was full thing but only receiving 17-25 hours and that was a problem of why we couldn't be engaged because he wouldn't save money because that's what covered his gas,insurance and phone bill. Now he's working at a airport for 40 hours a week and getting overtime and he makes over 600$ every two weeks depending if he gets overtime or not. But now he doesn't want that right now and wants to wait a few years. Can you imagine how I must feel? I know it isn't bad and it seems like nothing but it just feels as he's rejecting me and it's taking a toll on our relationship on my side of the view. He doesn't think anything but the way I'm starting to feel is crazy.. I bring up kids and he ignores me,it doesn't even be me saying 'I want a family with you!' It's 'oh my cousin just had her baby today!!' And he will ignore everything that has to do with a child and I just feel like saying screw it. Just my silly little rant but it's so upsetting:(