All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
There are some conditions that must be met for the marriage contract to be valid, the most important of which are the consent (and presence) of the guardian and the presence of two witnesses; for more benefit, please refer to Fatwa 83629. If the situation is as you mentioned in the question, that this marriage took place without the consent of your guardian, then it is a void marriage.
Therefore, it must be ended either by your husband divorcing you, or if he does not wish to do so, then an Islamic judge or whoever acts on his behalf would invalidate your marriage, as there is a controversy regarding its validity, so to end it, it must be invalidated; for more benefit, please refer to Fatwa 92478.
Therefore, you are obligated to repent to Allaah for lying and for disobeying your father’s order and marrying without his permission.
Finally, we would like to point to the following matters:
1- For details regarding the ruling on marrying an innovator, please refer to Fatwa 87880.
2- Your father is wrong by allowing you [as his daughter] to continue the relationship with that young man outside marriage.
3- We advise you to marry a religious man who has a good moral conduct, because if such a person loves his wife, he would honor her and if he hates her, he would not mistreat her.
Allaah Knows best.