Is the law of attraction real?+
Not as a law. There is no evidence that thought attracts matching events. The effects people notice come from attention, expectation and changed behaviour, which are real but work at a human scale and give no guarantees.
Does thinking about something bad make it happen?+
No. Worry does not summon events. It can affect sleep, mood and the choices you make when tired, which is a different and more ordinary mechanism. Fearing your own thoughts adds anxiety without adding safety.
Is it the same thing as manifesting?+
They overlap but are not identical. The law of attraction is a claim about how the world works. Manifesting is a set of practices. You can run the practices as focus and planning without accepting the claim at all.
Did The Secret invent it?+
No, it popularised it. The ideas were circulating in New Thought writing long before, in gentler and vaguer language. The film sharpened them into promises, which is why both the enthusiasm and the criticism grew so loud afterwards.
Can I be a sceptic and still journal like this?+
Easily. Skip the metaphysics and keep the notebook. Naming what you want, checking why, and planning one small move works as plain thinking, and it does not ask you to believe anything you do not.