You can't damn yourself for lust. Chemical like feelings that arise from your blood system because of hormonal attached feeling to women from the eyes and back of the mind. That's apart of your DNA as a man. God let you on the Earth because of the apple for you to grow because of the power and responsibility those feelings and thoughts have. To turn all of it for good purposes instead for the evil purposes they can evoke. Jesus came to let you know that you are only human and he died for your sins because well you have a body system full of chemical reactions and skeletal structure. You're only human biologically, by theology, and scientifically. In fact, how is it even possible to know if your life is even damned? Are you God?
If God was able to forgive a murderer before he became a king, then I think you should not feel guilty about lust okay. When the thought arises remember you are only human and walk forward ignoring the devil. We are only human. Don't feel bad about, and in fact feeling bad is how the devil can get you, because well he loves hate, and self-hating brings him back.
I hope I didn't sound delusional when I wrote this.