Have you made the decision to abstain from sex outside of marriage? If so, be prepared ahead of time for rationalizations that may creep into your head. Satan is real, and he whispers lies in your ear to try to convince you to go against what you believe.
If you aren't seeking God's constant protection, you may begin to believe the lies and do things you weren't planning on doing because "it's not that bad" or "it's not like I'm doing such and such."
When faced with decisions, don't take what seems to be the easiest path or the one that will make you happy the quickest; it might lead to even worse difficulties than you've already had.
You are a strong individual when Christ is in your life, and God has sent His Holy Spirit to enable you to make the right decision when faced with temptation. He is also there to help you make decisions that will keep you from being in those situations in the first place.
"Finally, be strong in the Lord and in his mighty power. Put on the full armor of God so that you can take your stand against the devil's schemes. Stand firm then, with the belt of truth buckled around your waist, with the breastplate of righteousness in place" (Ephesians 6:10-11, 14).
Almighty God, I choose to abstain from sex outside of marriage from this point forward, but You know I can't resist the temptation on my own. Suit me with Your armor and prepare me to stand firm. Amen.