Keep your wrongdoings to yourself.
The Prophet (peace be upon him) said, "All the sins of my followers will be forgiven except those which are disclosed to the people. For example a person commits a sin at night and though Allah screens it from the public, in the morning he says. “O so-and-so, I did such-and-such evil deed"
Sahih Bukhari Hadith No. 980 Book 78, Chapter 60 Narrated by Ibn ‘Umar (r.a.)
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The conditions or way to seek sincere Taubah or Repentance from the Merciful Lord is:
One is aware that he has sinned, and feels sorry and ashamed at his sin.
Makes a solemn covenant and promise with Allah that he will not repeat his sin again.
Turns to Allah and seeks forgiveness, before he has met with his appointment of death.
Is a believer and does righteous good deeds thereafter
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No one should know what I did last summer. (that's a figure of speech, there's no summer in Singapore)
timed, 2:47 PM.