The idea that the world is a simulation running on a quantum computer is a speculative hypothesis and not currently supported by scientific evidence. However, let's explore your question from a philosophical perspective.
If we assume, for the sake of discussion, that we are living in a simulated reality and you have the capacity to feel pain, it would depend on how the simulation is designed. In a simulation, you could be programmed to have the illusion of pain, even if you are not a conscious being or a program with true subjective experiences.
In a simulation, all aspects of reality, including consciousness and subjective experiences, could potentially be simulated. It is possible to create realistic simulations of pain and other sensations. However, experiencing pain within a simulation would not necessarily make you a conscious being with free will. You could be a program or an artificial intelligence designed to respond to certain stimuli, including the perception of pain, without having true conscious awareness.
The nature of consciousness and subjective experience is still a topic of philosophical and scientific inquiry. Determining whether a simulated entity within a hypothetical simulation is conscious or merely programmed to simulate consciousness is a complex question that remains open for debate.
Ultimately, the question of whether you are a program or not in a simulated reality is more of a philosophical and metaphysical inquiry rather than one that can be definitively answered based on our current understanding.