You are smart to know and say you are not ready becasue it is true. you are youn and need your education and independance , a job, a place of your own(when you are the right age) and your boyfriend must not understand really what he means or wants. i am 29 and having my first baby and even at my age it is a huge deal. it is not easy but when you are ready and of age to realistically have a baby you will. there is no need to rush-you have your whole life ahead of you. i am happy to see you kow this and are strong and not letting someone else talk you into something. you really have a good head on your shoulders! spread the word to help others girls facing the same issues. it happens alot and all these kids with split families these days-it is really sad.to be married , of age, and ready for a baby is one thing, this way it is planned and both want the baby-but for your boyfriend to fight with you about this is ridiculous. you both arent ready, he isnt even if he thinks he is.if he loves you he will know you are right and wait until the time is right.
God bless you! your friends are going through hurt and all you can do is pray for them and your friend.