It's a bigger monster than most of us can beat all on our own. Getting a book about it shows that you are making an effort to fight it. Nobody expects you to win this battle instantly and all by yourself. Cutting is just the tip of the iceberg - it is the part that is visible of deep problems that go all the way through us. You are not selfish or weak, and needing help to beat this monster doesn't make you selfish or weak either. Nobody can tell you how you "should" or "shouldn't" feel though - you feel how you feel. Feelings don't have to be rational.

<font color=orange>"Everyone has a need for significance; and if we can't make that possible, or even probable, in our society, then it will be obtained in destructive ways." -Rollo May</font color=orange>
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“We should always pray for help, but we should always listen for inspiration and impression to proceed in ways different from those we may have thought of.”
– John H. Groberg