I need advice to stop

I've been masturbating since I was like 12 and I'm 16 now it use to be just normal stuff on PH and it was very rarely that I would do it but now I use Twitter or X and the stuff I watch is much much worse and it's very often and I have a girlfriend and I'm trying to be more in touch with God and I just need to stop I keep saying this is the last time and I pray that the Lord forgives me everytime I just need help please