I am not trying to judge, lecture... This is just a personal opinion.
I'm 20 and is expecting my first baby boy in feb. Even at this age, I feel that I am way too young to be having this baby. First of all, you have to realize that your social life is going down the drain. You are 17, you have hardly started the whole party thing yet. And believe it or not... You will miss it. Childhood and youth is something that you cannot get back. You can have a baby... In 2 years.. 5 years and it would make hardly any difference. But there is only one chance for you to be a teenager. Grasp it and please treasure it. There is nothing worst then regret.
Another is finance. You might think this is not a big deal, but trust me it is. I am a restaurant manager, and my fiance is a technical director. We are both making pretty decent money, however money is still tight.
All I am trying to say is, please think this through carefully, and believe it or not, talk to your parents, they are right most of the time.