I have an unsavory character trait.
What is the trait you have that is unsavory?
I wouldn't be able to live with myself if I admit this.
You don't have to admit it to me if you don't want to. But if you have a trait that is bad, you should work on changing it. Everyone has flaws they can work on.
Voicing it out makes me sound real hateful and bitter.
As long as you know what it is, then work on it without telling others. Don't put yourself down like that if you want to work on yourself.