It sounds stupid and you will all tell me that but i really want a baby...?

i am 13 and i am really good with kids, my sister is pregnant with her 2nd and she is 23.. i really want a baby of my own, i recently held a baby of my sisters friend and i felt rly embaressingly broody..en have my neice to stay over and she is 10 mth old and she likes sleeping in my room cos i have this touch with kids lol. i want to be sucsessful in my life. would a baby ruin my life? i no my mum would Not be happy to say the least. an di dnt want stupid comments ! :D x