I really want a baby!?

I know what your probably thinking, a crazy girl thinking that a baby will solve all her problems and give her the love she desperately wants. Its not at all like that, I know what it takes to have a baby, I work with children myself and I have loads of personal experience with newborns and pregnancy blah blah. But this feeling is so strong I'm almost in tears when I see a pregnant woman or a mum with a baby, I get this pang in my stomach and I just want grab the baby and love it better than her mum ever could, I know that sounds crazy. I can't go on like this, always looking a baby clothes in shops and getting in conversation with mothers just so there's some chance of me holding the baby, what do I do?! I need to shake this feeling because I know I'm too young (I'm 18) and I've got my education to complete, what do I do with my crazy body clock?!