How to stop myself from being broody?

It's not immature or pathetic,you have a strong maternal instinct that's all,you sound quite mature knowing you want to make something of yourself first,all you can really do is throw yourself into that+try to have fun doing it,try enjoy being young+doing the things you should at your age,tell yourself you will be a mum when the times right+will be all the better parent for it. It won't make the ache for a baby go completely but hopefully it will ease it.