Hi there--welcome to Mothering and to parenthood! It sounds like your situation is somewhat complicated but you seem to have such a rosy outlook on it for someone so young! It's true that at your age thinking of your schooling is a number one priority, while both you and your fiance have the support of your families. I wonder what it would be like to seek out some counseling support to help you figure out how to explain all of this to your family. Do they know about that baby? It would be a lot to spring on them all at once!
So are you thinking about college at all after high school? Or a trade program? Something that would help you support Rosaline? (beautiful name!)
Wishing you all the best!