It probably depends on what are your guro interests but if you want someone suffer no matter real people or fictional characters then yes you are horrible person.
and you probably will compensate that with being moral crusader who relies on the law and ethic pretending that while you are horrible in essence, you are totally ok because you obey the law and follow the rules.( and also repeating the mantra "this is not real this is not real". )
I believe that this contradiction is also possible reason for liking guro in first place

Also logically guilt is just regret on what you already done, if you did not hurt anyone there is no reason to feel guilt.
I guess you must be referring not to the guilt but to the shame for not being a person which you should be according to social standards.


Since my guro interest is mostly limited to consensual stuff There woud be no reason to feel guilt even if I did something like that for real.