Firstly it’s very good that you feel you have wronged and you want to stop.
Allah is all merciful. He will forgive you. You must believe this. But this act is damaging you badly. It’s worse than poison. Your future will be very negatively affected because of it.
Please watch this clip I did. Also another clip on pornography. You need to do what is recommended. Practice it and reward yourself with halal if you don’t do the haram. You must busy yourself as boredom makes you think of haram. Ultimately maybe marry temporary or permanent to save yourself and your religion. But don’t give up as Shaitan wants you to give up