Sister, to ocassionally commit a mistake (i.e. a sin) is normal and except for the Prophets there is no human sinless. But you have to repent and get back on track, and not lose hope in Allah's Mercy and Forgiveness: الَّذِينَ يَجْتَنِبُونَ كَبَائِرَ الْإِثْمِ وَالْفَوَاحِشَ إِلَّا اللَّمَمَ إِنَّ رَبَّكَ وَاسِعُ الْمَغْفِرَةِ هُوَ أَعْلَمُ بِكُمْ إِذْ أَنشَأَكُم مِّنَ الْأَرْضِ وَإِذْ أَنتُمْ أَجِنَّةٌ فِي بُطُونِ أُمَّهَاتِكُمْ فَلَا تُزَكُّوا أَنفُسَكُمْ هُوَ أَعْلَمُ بِمَنِ اتَّقَى"As for those who avoid the [truly] grave sins and shameful deeds - even though they may sometimes stumble behold, thy Sustainer is abounding in forgiveness. He is fully aware of you when He brings you into being out of dust, and when you are still hidden in your mothers’ wombs: do not, then, consider your*selves pure - [for] He knows best as to who is conscious of Him." [53:32] Read this Khutbah on the importance of seeking forgiveness from Allah ta'ala and repenting from sins. If you don't repent as soon as possible and persist in sinning, then the following Hadith in Tirmidhi describes what happens to your heart: "Surely, when the servant commits a sin, a black dot appears on his heart. If he repents from it, his heart is polished clean. However, if he increases in the sin, the blackness continues to increase. That is the statement of Allah: “No! But that which they used to commit has covered their hearts with rust.” [83:14]" Reading the commentary of Ma'ariful Qur'an on this Surah will be very helpful as it also mentions a few punishments in this world.