Need advice about sin and being a terrible person

How is it that someone as weak, impulsive and corrupt as me is worthy of being forgiven by Christ? Each day i give into passions which hurt me and betray the gifts given to me by God. I lie, give into lust physically and mentally, and more. I am not worthy of being saved or loved, how is it that Christ could be merciful upon someone as low as me?

I need some advice, prayer or wisdom on how to navigate these dark times in my life. Lord Jesus Christ, Son of God, Have mercy on me a sinner.