Didn't want to be a mother but am a mother

Irene • I am a single mother of 1 son. He is 8 months old. I live with my folks and my goal is to live on my own.
I had a hard time with this because I could never really see myself as a mother even though I am old enough to be one yet people would think I am young of i shared my age. Yet I felt like I was too immature to be a mom yet I was good at bossing people around and telling others to do and babysitting other people's kids (cause I didn't have to take them home with me) made me think having my own child... Well.... I didn't see that in the cards for me but I had a pregnancy dream once at the age of 12. (No Joke.) I can describe the room to the tee what it looked like and when I had my son it was the same exact room in my dream. I know most of you might think I am crazy... That's ok but it is the truth. 
Does anybody feel like this at times I bond with my son. Yet I never wanted to be a mom just yet. If you look at me and the way I dressed you would think of me as more of a nanny or babysitter type. Not being the mom type. (Then again what does that even mean?) it's been three months and end thought hasn't sunk in yet. Yet I am doing everything a mother is suppose to do for her 3 months old. It's l so confusing at times. I mean I know how it happen, yet the question keeps popping in my head "how did this happen?"