Asalamu Alaykum,
When I was 14 years old i started to masturbate 3 to 7 times daily. sometimes i didn't have chance to make a غسل from the جنابة and pray the daily prayers without having qusul. I never prayed the morning prayers, my daily prayers were ever 4 prayers, some prayers i was clean and some of them i was unclean because of them masturbation. I did this for 11 years and I used to mastrubate at Ramadan daytime. I don't know how much prayers i missed because of uncleaniness of the masturbation, how much morning prayers i missed, how many prayers and fasting were valid and how many ramadan days i masturbates at daytime. Some scholars says that if i left my morning prayer then i was a Kafir and i don't need to do my prayers and fasting again. If i don't know the exact number of invalid prayers/fasting and missed prayers and invalid fastings because of masturbation, Therefore what shall i do, do i need to do all my prayers and fasting for the last 11 years? do i need to do كفارة. Alhamdulilah i am now 25 years old i am now in a very good condition and I did the tawbah, but i want to clean my past actions.. Hope you guys jasaka allahu khayrn will provide me with useful information

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.

All praise be to Allaah Who guided you to the straight path and enabled you to repent from those evil deeds because abandoning the prayer, invalidating the fasting and masturbation are forbidden, especially abandoning the prayer. Some scholars are of the opinion that abandoning the prayer even though one acknowledges its obligation takes a person out of the fold of Islam. However, a person who abandons the prayer is not ruled to be a non-Muslim and he is not treated as such unless the evidence is established against him, but the majority of the scholars are of the opinion that abandoning the prayer while believing that it is an obligation does not take a person out of the fold of Islam. For more benefit, please refer to Fatwa 85264.

As regards the issue of making up the missed prayers that a person missed deliberately, some scholars are of the view that whoever abandons the prayer deliberately should not make it up, while the majority of the scholars are of the view that it is an obligation to make it up, and this is the preponderant opinion in our view in Islamweb.

Therefore, you should make up the prayers that you missed including those void prayers which you performed while in a state of impurity. If you do not know how many prayers you have missed, and how many fasts you invalidated because of masturbation, then you should make up as much prayers and fasting as you predominantly think that you are acquitted from liability; for more benefit, please refer to Fatwa 83727.

However, you are not obliged to expiate for the days of fasting which you invalidated due to masturbation; you are only obliged to make them up and repent. For more benefit, please refer to Fatwa 89038.