Agree with the others.
Just wanted to say that the priest likely knows you are struggling with saying the name of the sin so just say, I am struggling with the name of this sin, it’s lust with myself, or use the word masturbation. believe me the priest has heard it before, many many times. But the point is tell him you find it hard to say it, also tell him, you are finding it hard to stop doing it and you feel ashamed of that. that is part of the sin. Confessing that shame and struggle with the sin and with confessing it, will help you. God bless you