Babies are pure joy....planned or unplanned. No matter what happens I wish you years of happiness!
Big thumbs up to you for a) wanting to keep the baby (too many view abortion or adoption as a means of birth control) and b) to the father for wanting to be an active part of the baby's rearing. That is really great! No matter how things go between the two of you, you are both a Mom and Dad now and the best thing for the babe is to have that support from both sides regardless of if you are living together or not. I think what you are doing is a really great thing and I sincerely wish you all the best.
As far as your parents go....you'd be surprised how much love and support comes from within. I was terrified to tell my parents about my first pregnancy (only because it wasn't planned, not an age issue) and their only reaction was pure joy. Tell them, be honest and upfront and have the conviction that they will support you. That's what family is all about.....supporting our loved ones when they need it, regardless of how you feel about the situation. I think you may find you'll be pleasantly surprised! After all, all parents dream of grandkids!
I wish you all the best! There are lots of us Mom's on the site so feel free to ask any crazy questions that may come up (and they will!) during your pregnancy! We shall be here to offer support and help where we can!