I'm going to do it and the police won't be able to stop me
What exactly are you going to do?
Something that will change the world.
You sound very ominous and I do not think you have a clear head at the moment and may regret doing something that you really do not want to do. I do not recommend you say things like this as people may see you as a threat and may really call the police on you.
I'm smart enough to plan an attack that is not traceable by the police.
I would be really thinking twice on what you're planning to do. You will be causing someone harm and even if you think you will be untraceable, the police may have a way to trace it back to you and you may end up in jail. I strongly recommend you just focus on yourself and try to look for things that would make you feel better.