Don't know what to do... he wants a baby in 4-6 years.

So a long story short and without too much detail... my boyfriend and I have been together for 3,5 years we are 22 and 24 years old and we've been through a lot together.. also one unplanned pregnancy, which ended in a miscarriage. And ever since then I basically want to get pregnant again (it won't happen since I'm on BC). My boyfriend and I talk about in regularly, but he is mostly making false promises. I just want something to look forward to and some sort of security. And thats just kind of tearing me apart, since I'm not getting that. I want us both to be ready and make sure we can have a baby at the right time but I don't want to wait like forever.. i just feel like he thinks his life will be "over" when we would have a baby and that's what's holding him back. He told me he wants to TTC in 4 to 6 years and I just feel like i can't wait that long.. it's literally killing me every month. I've given up a lot to be with him in this place we are now and I just want something back... I now a baby is a big deal.. so that's why this is a big deal 😅 Has anyone else experienced something like this and how did you solve this together? I know we're both young and but i want to be a young mom and I'm still studying but I can handle it all together.. we have an apartment together, I also work atm and own a car and my SO I nearly done with his study. Any advice is welcome ☺️