He DOES NOT LOVE YOU.
You will NEVER be a happy family with a man like this. NEVER.
This man is a monster INCAPABLE of really feeling that emotion.
He did NOT beat you because of the baby. He beat you up because HE IS A HORRIBLE, VIOLENT THUG.
Even being absolutely distraught at the thought of a baby that you don't want isn't a reason to beat someone up. NOTHING is really a reason to beat someone up except the fact that the person doing the beating up is a VIOLENT MONSTER.
If you weren't pregnant, he would be the same person, and when things didn't go his way at any other time, he would beat you up. That's how your life will end up if you abort your baby and stay with him - you will still be beaten up. You will try and make yourself obey his rules and wants as much as you can, but you'll still get beaten up eventually, because HE THINKS IT'S OK TO BEAT YOU UP. You will have lost your baby, but it won't improve anything. You'll have a thug for a partner who hits you when he's angry or upset about something.
Please, please stay away from this horrible man. He'll ruin your life. He will.
Being a single parent is tough, but it's a BREEZE compared to being a mother with a violent partner. Even if you aborted this baby, if you ever want children, and you stay with him, you are looking at a life of misery and bringing up unhappy, afraid children.
Walk away. Do what YOU want to do about the baby, but get away from him first. He will drag you down and down, love. He will.
Please choose to give yourself the chance at a proper, happy life, full of people who love and care for you. Get him OUT of your life and you leave the way open for finding REAL love and happiness - a REAL partner who, when there are problems, will talk to you, find a solution, be supportive, not blame you for things that aren't your fault. Someone you can rely on. Someone you don't have to fear.
That isn't him. You are SO young. Please, please don't ruin your life.
Talk to your parents if you can, tell them what he did to you.
Keep posting and there are people on here who can give you information on places you can get support that will help you achieve what YOU want - whether it's keeping your baby or not.
You won't be alone. Stay strong.