I want to commit a violent act
What do you mean by violent act?
Violence means I'm about to do something harmful towards another person.
If you want to commit violence against someone, you should seek help. It isn't normal to fixate on violence and you should get professional help before you act on it.
Well then what if I wont hurt a person?
You should not take out violence on people or animals or anything else. If it keeps bothering you so much you should get some therapy before you do something you might regret.