Baby fever

I'm only 19, but I have a really bad case of the baby fever. Like I just want one so bad I wanna feel the excitement. But I don't think I can have baby's me and my boyfriend have been together for 3 years and I was on depo for little under a year , but we don't use protection or any of that he busses in me every time and still nothing but he also smokes almost every day. But how can I beat this baby fever 😩