You had sex before marriage? You had relationship after relationship?You were addicted to drugs?You drank? You commited grave sins? You went against the commandments of Allah? You had a moment of wavering faith? The world shattered you? (1)

Your mistakes are NOT greater than his mercy. Your sin is not greater than Allah’s forgiveness.your shortcomings are not more encompassing than HIS gentleness.Your flaws are incomparable to his perfection. Your falling is not greater than his raising.

Allah's apostle said, "Every son of Adam sins, the best of the sinners are those who repent."
— Sunan al-Tirmidhi,Hadith no. 2499[14]

Allah's Apostle said, "Allah is more pleased with the repentance of His slave than anyone of you is pleased with finding his camel which he had lost in the desert."
— Sahih al-Bukhari, 8:75:321[16]

Allah's apostle said,"By Him in Whose Hand is my life, if you were not to commit sin, Allah would sweep you out of existence and He would replace (you by) those people who would commit sin and seek forgiveness from Allah, and He would have pardoned them."
— Sahih Muslim, 37:6621

I'm in no place to talk about what's right and what's wrong because I'm a sinner myself. Sin is something we can't escape. But we shouldn't despair but repent. You commit a sin, accept it and ask for Allah's forgiveness.
It's the best we can do in a world surrounded with sin