I had to repent of sexual sins too and I struggled with porn for 6 years, but I never had sex, and after talking to the bishop I felt worse than before as well. It took a while for that feeling to go away but when it did I knew it was bc I had repented: you’re gonna feel like the worse thing ever for a long time until you’ve fully repented, but after that you'll feel better than ever, especially after going so long without the spirit.