will god forgive me if i keep sining the same sin

I believe that god will forgive you because it says in the bible that the lord is a forgiving father and after all i dont think or believe that EVERYONE WHO MADE A POST is goin to HELL! God just wants us to repent!  But, i keep on doing it time after time , but i want to stop i just dont have the will power. I've asked god to instill the will in me to stop but i still dont have it. I believe that lusting as we all know is a sin, and we lust because or at least i can speak for myself. So i lust because I'm turned on so by masterbating it ''Takes care of the hornyness '' {SOMEWHAT} Or at least {FOR A WHILE }. So i guess what im trying to say is I masterbait so i won't lust as often. 

Thanks, for reading my post<.

Let he who is without sin cast the first stone, and all that. 

God knows that we all stumble. All without exception, except Jesus of course. Of course, you are not meant to "sincerely regret" your sin just before confession (if Catholic) and then "accidentally" have another moment of weakness right after, and carry on in that fashion. Your sin being premeditated makes it worse. Especially if you keep doing it. 

But also, not all Christians agree that masturbation is a sin. Is masturbation a sin in God's eyes? I suggest you read the Bible with a special eye for passages you think might be relevant. Make your own interpretation, sincerely. (Don't look for what you want to hear, look sincerely.)