When it comes down to it darling, it is OUR decision! Definitely don’t let your step-Father force you into something you may very well regret for the rest of your life. I believe a woman should have the right to choose themselves, personally, in my heart, I just wasn’t able to take my baby out of the world. Even if you feel you may not be able to raise the child, there are other options, such as open adoption where the baby can grow up knowing you.
Perhaps if you decide not to, you could show your step-Father some of the abortion videos that have been listed numerous times here. I don’t think he’d have much to argue about after that.