We all have sins that we need to repent for. Here is a beautiful dua to repent for sins and we should say this every day inshAllah. 

اللّٰهُمَّ بَاعِدْ بَيْنِي وَبَيْنَ خَطَايَايَ كَمَا بَاعَدْتَ بَيْنَ الْمَشْرِقِ وَالْمَغْرِبِ، اللّٰهُمَّ نَقِّنِي مِنْ خَطَايَايَ كَمَا يُنَقَّى الثَّوْبُ الْأَ بْيَضُ مِنَ الدَّنَسِ، اللّٰهُمَّ اغْسِلْنِي مِنْ خَطَايَايَ بِالثَّلْجِ وَالْمَآءِ وَالْبَرَدِ.

Allahumma ba’id bay-ni wa bay-na kha-ta-yaya ka-ma ba’ad-ta bay-nal-mash-riqi wal-maghrib. Allahumma naq-qi-nee mi-nal kha-ta-ya ka-ma yu-naq-qas-thaw-bul ab-ya-du minad-da-nas. Allahummagh-sil kha-ta-ya-ya bil-ma’i wath-thal-ji wal-ba-rad.

O Allah, separate me from my sins as you have separated the East from the West. O Allah, cleanse me of my transgressions as the white garment is cleansed of stains. O Allah, wash away my sins with ice and water and frost.Bukhari 1/181, Muslim 1/419.