Stuck in the middle! HELP?!?

Me and my boyfriend have been together for 2 going on 3 years. I am 17 going on 18 soon and he is 22 and got a little ways until 23. I graduate in 2018 and I honestly feel as if I want a baby. I feel like I am mature enough for it and financially okay with it. I know they are a lot to take care of and can affect my school,but I feel as if I could do it. My boyfriend is iffy because I haven't graduated yet and we don't live alone. It is very frowned upon in my family to have a baby in high school,but I am my own person and I feel like I'm ready. Please help!