a child

hey everyone, i just found out from my girlfriend for 9 months that she is pregnant. We talked about our options and she decided to keep the child. I find myself soo scared not knowing how its going to be. I have not met her parents and she has not met my mother yet. I have no idea where to start, i feel unprepared for this. I do have a good full time job and been living with my brother in our own place for about a year. I wanna say i can step up and be the great dad i know i can be, but i feel soo lost. Im the first of 3 siblings to have a child and the first of all the cousins. I just turned 25 in june. My girlfriend has 2 girls from her previous boyfriend. One is 7 and the other is 2. Me and her were never married. I want to be confident in all of this but im soo scared, I honestly do love her, shes unlike anyone i ever met. She enjoys me for me. She sees a great person in me and i do to her. But i still feel scared, i dont know what to say to my family, i just need some comfort and advice.