The fact that you question yourself speaks much about your character. I think that your Jesus would realize that you are but a human being. He of course was an exceptional man. He asks you to TRY to live in his ways. Im sure he knows that at times his followers will slip. That is why he offers you the opportunity to be saved.
You can only expect of yourself what you know you are capable of. You will learn what your strengths are through time and practice.It sounds to me like you are taking the bible a bit too literal. Cut yourself some slack and relax.
You know what you are capable of and so should your deity. And remember your Lord is a forgiviing one. Ask to be forgiven and you will be.
Try to follow the ways the best you can, you will find strengths in yourself that you may not be aware of. And trust your Lord to help you find them. Ask for his help and guidance. I find daily pray to my deity helps me.
I keep a daily running dialog with my deities, it helps me to gain the guidance I need to make the hard choices I need to make. Some days it helps me just get through the day. You can never pray too much.
Meditation might also help you. Try it. Your Lord may chose to speak to you at this time. Open your heart and mind and listen.
The only difference between you and I are the religions we follow. You are Christian and I am Wiccan. I pray several times a day, I follow a code of ethics much like you do. I try to live a good clean life. As I am sure you do.
As I said the fact that you question yourself speaks much about the kind of person you are. You strive to live up to the standards that your Lord asks of you...or you would not question yourself as you do. Keep asking your Lord for guidance and I think you will in time find the answers you seek.
Blessings, love and light
Aviana