I can promise you that there is nothing new undef the sun. There is no such thing as a new sin and your priest have heard it all before. I have heard priests say the same thing, and especially sins with regards to lust is very, very common, especially these days. Most people struggle or have struggled with these sins, naturally.
With regards to sexual sin, I know very well what a great shame they bring. But always keep very close to your heart that even though you’ve sinned and feel bad about yourself. Even if your own heart condemns you, remember that God doesn’t condemn you. God loves you so so much, even so much that he chose to die on the cross in order to save you and free you from your sins. Know that He would’ve done it again even just for the sake of the salvation of ONE soul. Always remember that.
God is waiting for you in confession and He longs to forgive you. God longs to keep you close and let Him love you. God loves you endlessly and His mercy endures forever. Always keep that close to your heart.
The Devil often tries to tempt us into thinking that we’ve sinned so grave that there is no mercy. That is a huge lie, perhaps the biggest lie ever. Know that no matter how you feel about yourself, you are not your sins and they don’t define you. God has seen you on your darkest and He still loves you endlessly.
God gave us the sacrament of confession because He knew we would need it. He knew we were gonna sin and fall, and therefor He is ready to help us back on track. He longs to forgive you and free you from the burden of sin.
I will pray for you. God bless!