am I too young for a baby?

so i'm 17, and i live in my own 1 bedroom apartment on my own, and ive been with my boyfriend for the past 4 months and its going good. i've been thinking for a while that I want a baby but im scared i'm too young to 'want' one, my stepmum lets me have her babies at mine all the time so I know what looking after a child is all about, and when i lived at home ive always had younger siblings but was wondering what everyones opinion is. I know love sometimes doesnt last forever and I know sometimes things dont work out the way we want them to but is it too early to start to try for a baby? im fully prepared for doing it all on my own if worst comes to worst as I have a supportive family.