Contraception is never OK. For serious reasons, Natural Family Planning may be used to delay having children, even indefinately. But I feel compelled to ask you if you think your own life was a mistake? I hope you say, “No”.Every life has value, and no one is conceived without God’s permission.
While this is a serious issue, it is not too big for God. When considering marriage, ask your future spouse if she is glad you were born. Obviously her answer would be a resounding, “Yes!”