The evidence of our world being a simulation are the "glitches" we have detected in terms of unexplained phenomena AND the implications brought forth by quantum mechanics. Also the fact technology is always progressing and if simulated worlds like ours are possible in our future, what is to say they haven't happened before and that we are currently in a simulation (this is the Elon Musk argument).
You have a hard time with direct questions
Here's the list of questions. If you don't want to answer them then go quote somebody else
Is there a real world on some level? Meaning: even of this is not the real world, there has to be one somewhere where the computer is, right?
So just "yes" or "no"... Is there a real world?
If so, who made the computer? This is open ended. The real humans? G-d? Aliens? Other dimensional beings?
Who made the simulation? (A few words are enough for this answer)
The next one is more of a statement. If there IS a real world SOMEWHERE... you can't assume that this isn't it.
All your reasons for thinking this are nothing close to evidence. So given the actual world we can see, we have to assume this is the real world
CAUSE THE ONLY EVIDENCE CONTRARY TO THAT STATEMENT IS IN YOUR IMAGINATION
It's good to be skeptical and free thinking but pure skepticism without any guiding principle or any way to know what's true (or at least likely) is useless.
You will never ever get beyond step 1 with anything cause you think your imaginary stuff is just as real as real stuff. You're stuck on confused just spinning around and around.