how do i tell my parents that im a dad even though i dont want to be?

[Jaemie]

when i was in middle school there was this girl that liked me i was in the 7th and she was in 8th grade. at the time i heard that she was easy and that she wanted to go out with me, i didnt like her back but she had nice body features and i just wanted to lose my virginity , about a week later after we knew each other things happend. after she went on to highschool i moved schools at the time too, and now 3 years later she found my facebook account and sent me a long message saying that ''she needs help and that i need to call her as soon as possible because i f***** up'' thats exactly what she said and she showed me a picture of the baby , im really scared because i never thought that this would happen to me , the picture hit me so hard because the baby looks just like her but she has my blue eyes and red hair , she also told me shes 1 year and 8 months old . someone PLEASE give me advice , im 16 now and im guessing shes 17 now , but im only halfway through highschool and i already have a girlfriend! how is it even possible for me to make a girl pregnant at the time , i was only like 12 ! can i just ignore the mesage and close my account? because it seems like nobody else knows but her and her parents, i just dont know what to do.