Hey Hun,
I know this can be a scary time, especially since it was unplanned (although not unwanted), but now is the time to plan, and get organised. Your first steps will be go make a plan with your boyfriend, go to a doctor and get your bloods done (and a referal to a hospital), so you can show your parents that your being responsible. The next step is to talk to a councler about your education, maybe consider home schooling to finish, or a special young mums school, because finishing is important, and your parents will think that too.
Sit down with your boyfriend and discuss how you are both going to handle this, will you move in together/stay with parents and save money? Will he get a job to help support the baby, all this needs to be discussed, so when you tell your parents whats going on, they will see that you have thought about it, and know what you want.
The first 14 weeks of pregnancy is hard, you have little to no energy, and quite often can feel sick. Get as much sleep as you can, and try and eat heathy food that dosnt make you throw up (green apples are great). Don't worry though, it is normal, and it will pass.
Just stay positive, you have a little life growing inside of you, who you will love more than you ever thought possible. Look after that tiny baby by looking after yourself, eat well, rest when you need to, take some pregnancy vitamins, and you will be fine. Age really is only a number, and the reality is, your baby dosnt know how old its mum is, and it wont really care when it does.