How do you love yourself when you know you've made some really bad mistakes in your past?

I am going thru this myself. I feel as though my mind is haunted by the past, my past choices, the thoughts of wanting my marriage to work, but feeling extremely haunted in the sense that ill never feel comfortable again with the idea of US (my wife and i), never feel comfortable with myself as a person. I feel like i just want to give up on my marriage. I have too many trust issues. My wife and I are two entirely different people. I feel like i have put her thru so much and i dont know how to live with it anymore. She says she loves me etc and wants us to work etc and yet she is prepared for the idea that it might not work, after 10 years. Feeling lonely and heartbroken...