With my first pregnancy, my (obviously now ex) boyfriend left me when I was 5 months pregnant. It was horrible, I was very lonely and had to go through giving birth with just my mom there. She came around shortly before I went into labor, but the other members of my family took some more time. I think I know what you're feeling right now.
About abortions: yes, it is your choice. It is your body. But I want to make sure you're aware of the following. If you decide to keep the baby against the will of the father, you can't expect anything from him in forms of emotional or financial support (yes, I'm aware you can claim child support, but trust me when I say that it will cause issue after issue if someone is unwilling). It will be very hard and going through a pregnancy on your own is no walk in the park. I am absolutely not telling you what to do, just trying to paint a realistic picture.
That being said: I would sit down with your boyfriend and discuss the possibilities. Ask him straight why he doesn't want this baby; maybe he's just scared. And, if you don't tell your family, nobody will even have the chance to offer support. We have a saying in The Netherlands: you already have a 'no', but a 'yes' can be received. Meaning that if you don't ask, chances are slim to none that they'll say yes. Just try, they'll find out sooner or later!