Fellow degenerate here. I know how you feel. Yesterday again I caved in and masturbated. I wish it was vanilla but alas it's of the disgusting kind.
God can forgive you, the worst things you can do is
1)Act like your sinful act is no big deal. That's the way to become lukewarm
2)Act like you're irremediable
Slap yourself in the face, splash yourself with water, get on your knees and pray sincerely. God will pick you up again as long as you're sincere.
You're not alone anon. Just look at the purity thread.
I once managed to last a whole month and I basically used pic related. Destroy sinful thoughts the very moment they enter you. Don"t do as I did and "well, I'm gonna check some ecchi pics because it's not really porn and I can resist"
Just banish them