Yes, you WILL have to grow up, fast. Hiding being pregnant isn't being grown up - if you want to keep the baby you WILL need to step up over the parapet and tell people, and he prepared to accept that they may have a negative reaction to start with.
It probably wasn't in amongst your parents, or your partner's parents, to have you becoming a parent at 15/16, and it WILL take them time to readjust their expectations. Give them that time, a time to yell and cry. 9 times out of 10, family comes round once the baby is here, because your baby will be their family.
Don't expect your parents to offer to help with the baby - it would be nice if they offered, but don't expect it. You won't BE a child any more, once your baby is born, so they will have finished raising you.
ONLY keep the baby if you know that you can cope, and support the baby yourself, without the help of your parents, as they may not want to help, AND without the help of your partner, because he may not be able to cope himself.
If, and only if, you can get a back-up plan together yourself of away to self-support you AND your baby, then make a decision to keep the baby.
You need to understand that life as a young parent is incredibly difficult, far more difficult than being a parent at a more 'usual' age.
While your friends are going off to college, going out to parties, you will be looking after your baby. Your baby might not be happy to settle for anyone else but you, not all babies can be left with sitters.
When you are a slightly older parent, your friends are at a similar life stage, and once you have children, your social life revolves around play dates, soft play, park visits and baby groups. It's not quite the same as going partying.
You can't just go on vacations either. Or if you do, it's not the kind of vacations your friends will be going on.
I know I'm making it sound bleak, but I want you to REALLY consider every angle. I didn't. I love my Daughter with every fibre of my being, but there are still, even now (possibly more so, as I look at my DD and realise just how young I really was when I had her, how much of a child 'playing at being a grown-up' I actually was...) pangs of regret over the things I never got to do.
You also need to consider the more serious side of having a baby. How would you manage if your child had some form of disability? Would you be able to cope with a severely disabled child?
My DD has LD'S and other health issues. It's not been an easy road, but I knew right from the start that I would be able to keep going, even on my own.
First things first, you need to start taking Folic acid. NOW. Whether you decide to keep the baby or give the baby up for adoption, you need to give your baby the best possible chances. And the first 12 weeks, it is important for your baby for you to take Folic acid supplements. You should be able to buy this in a drugstore.
You also need to get your prenatal care sorted out.
These are the first things that will show people that you are serious about this, and have thought about everything.
I am here to chat to you about anything that you are worried about, or might need advice about.
I wish Mumsnet HAD been around when I was pregnant at 15!