Blame yourself for the mistakes you have committed.
Blame yourself if you ever suffer.
Blame yourself also for negative feelings you felt.

Cos i believe you are totally in control of your life. Nobody ask you to feel sad. You can feel happy even though you are sad, cos you should be happy for others who are happier than you. Nobody ask you to feel happy too. Even though you are happy, you can be sad too, cos others are not as happy as you. Indeed, you should be sad for them.