Ok... Let's get real here.
1. Is sex outside marriage a sin? Yes and one that can lose our salvation.
2. Will God forgive us if we repent (stop and turn away from that sin)? Yes
3. Are we called to admonish a sinner? Yes.
Just read Paul's second epistle to the Corinthians, it opens with a confirmation that a sinner should be admonished to help effect his/her repentance and a caution to not over do it.
Sex of ANY KIND outside of marriage is wrong! No compromising the Word of God. Consider God's Word before our parents' words even before our Pastor's words.
If you don't want to hear this from me or any of these other posters, take your case to God, Please! But, be prepared to meet the side of God that hates sin, and be prepared to go to your knees in repentance.
Of course God will accept repentance and forgive us. He promises to do that, but repentance means we don't do it any more, not that we don't do it until the next time! That is not repentance...