Right, first off, I think that some people on here are being a bit harsh in my opinion, as it seems like you truly are scared and some of the things you wrote just came out in the wrong way. It's true, I don't understand if you were using protection then how did you get pregnant without knowing until recently but anyway... I'm sorry to hear that despite your boyfriend wanting you to have an abortion too he is not being there to comfort you as yes, abortion can be very hard and if you know you won't provide a good life for your baby then so be it, that is your decision to make and not for others to judge.
I think that if you aren't willing to talk to family and friends then get your GP to refer you to a group, telephone line, anything, just someone you can talk to. Sometimes, talking to a stranger is easier than a family member. At the end of the day, abortion can really strike you emotionally and if you have no one to support you then it could leave you emotionally scarred, unless, you think you can handle it yourself, which there are some women who can.
Quite frankly, when girls so young(and younger) get pregnant, it disgusts me when they keep their baby and it is obvious that they can not provide the necessary emotional and financial support to have a child and rely on the parents(some families may be fine with this), benefits, etc, rather than give the child up for adoption to a family who may not be able to have children themselves but that is my opinion, at least you acknowledge you aren't in the position to care for a baby and so is doing something about it, which others may or may not agree with.