I don't know if something is off, opinions?

Horseshit. Get a job, this is the sign of a very idle mind.

You should seek out psychiatric help as soon as possible!

Go to hell

It ain’t easy being a psychopath ;)

You never have to teach a kid to do bad, they can do it all themselves. I think that what you’re dealing with is an immature mindset.
You’d do it for fun, just like what other kids do. You’d do it cause you could, like what other kids do. You don’t know why you'd want to do it, you just would.
The harsh fact here is I don’t believe you’ve grown up. Murder and torture feel good to an immature mind. It doesn’t take much stimulation for that immature mind to have fun.
You’re claiming to be smart, and possibly different in a superior way because you can do bad. News flash, anyone can. Literally anyone can make another person suffer. It’s extremely easy to do. That’s not special all, it’s not different either.

Tldr, You’re extremely immature, I suggest finding ways to advance your mind and not just stimulate it in its primal state.

Your use of LOL is irritating.
Nothing personal.
I've had simular ideas.
But, only about people who had wronged me, in very bad ways.
Never about strangers, etc.
If you are as intelligent as you claim.
You should find a better use for your thought energy.
Then to waste it on hurting others.

It's normal to think anything as a fleeting thought. The fact that you fixate on it daily means you are fucked up in the noggin.

you're fucked in the head but so what nearly everyone else is too

Your need to harm others may come from a feeling of resentment either on an individual or society

This is strongly a symptom of having psychopathy, or antisocial personality disorder. I strongly advise you to see a professional, I don’t mean it as an offensive way at all. I would say talk to a psychiatrist about it even though you don’t act on it.

You have been abused and have PTSD. Seek therapy. <3

There is nothing wrong with you.

what’s the origin of these thoughts?

Also, I know my brain is different than others because I can do mind puzzles so easily. The ones you have to take apart and then put back together takes me maybe on average about 30 seconds to 1 min (level 4 and 5 puzzles). I try not to look at how to do bad things because I know my mind will actually figure out the fastest and easiest way to do it and then I get an urge to do it. As a teenager, I loved stealing from stores, waiting a couple days, and then secretly returning the item back to the shelf because it was a game to me. I figured out the system, broke it down how to get the item, the best way to stash the item, and then the best way to get the item out without anyone knowing or damaging the item.