Becoming a Christian is very often not translated into becoming born again. When Christ changes us into a new creation we begin our growing process that never ends until we go home.
Ephesians 2:10
"10 For we are his workmanship, created in Christ Jesus for good works, which God prepared beforehand, that we should walk in them."
If you are attempting to change yourself, it is fleshly desire to remain in control of your own life. Rather than trying to be a good person on your own, in your own strength, one must confess sinfulness, ask Christ to change you and then begin to trust Him to make all the changes in the WAY you think which will result in the way you act and even the way you process life.