I'm 16 and really want to get pregnant?

I'm 16, and I really want to get pregnant! I've been with my lovely boyfriend for a year, and he's a year older than me, and I know being a father would ruin his life, but there's this little part of me that yearns to be a mother. I get all lovey dovey whenever I see a cute little kid in a mall or wherever. I know deep down that I'm not emotionally or financially ready for a child, but I still want one! There's a girl in my year who's a mother, and I feel envious towards her. The weird thing is is that I've always been repulsed by the idea of children, but all that has quickly changed. Are these feelings just normal or is there something psychologically wrong with me?