Hi, thatgirl,
If your concern is that you really might in real life become a serial killer, or even just a one-shot killer, please be aware that huge numbers of people have such dreams who never commit the slightest crimes. It's simply a clue to strong feelings you have about someone or something. You may be very angry at someone, very resentful of someone, or otherwise feel in a very negative way toward someone. Analysis of the dream can lead you to finding out just who or what you're angry at or resentful of. You do not need to be frightened at your own personal potential for homicide.
When interpreting dreams, only you can do it. Only you understand yourself sufficiently to be able to tell what the dream really means. Even a T isn't going to be able to tell you what the dream means, though they may help you figure it out. The most fruitful line of inquiry, I would think, would be to feel out who you really feel angry at. Beyond that, it's up to you. Hope this has helped. Take care.
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We must love one another or die.
W.H. Auden
We must love one another AND die.
Ygrec23