I'm going to try to ruin her marriage.
Why are you going to try to ruin her marriage?
I want her to feel as worthless as I feel.
It is evil and wrong to break up a marriage because you are bitter. You should get psychological help if you feel the need to hurt others.
It's my personal feelings and I feel good about it. You should mind your own business.
Creating problems in people's marriage will cause suffering and won't solve the feeling of worthlessness that you're experiencing. Improve your own life instead of trying to ruin other people's lives.