i have a stepfather that I call dad, he met my mom when i was a baby. my real dad was never there too much.
Aww I am sorry that your real dad wasnt there for you, I also have a stepfather. Since step dads are non-biologically related to you, It can be hard to adjust. 
it was easy for me, i dont remember them meeting, i just remember him alwaysbeing there. im a grown adult with my own family now and i still call him dad, hes remarrried but we still visit and hang out
Ah ok thats good at least. I know that children in a stepfamily may usually live with one biological parent, or they might live with each biological parent for a period of time. But it depends on custody and stuff.