I get the feeling of discomfort but it's basically the same feeling we get when someone breaks a pencil

There is no evidence that a mosquito is capable of feeling the kind of despair or horror that a human would feel in a similar situation. It's unlikely that mosquitos can form emotions at all.

At the same time, a huge portion of human-animal interactions involve the human controlling the animal in ways that they animal can't even comprehend. A dog has no idea you're doing operant conditioning to change their behavior. Pigs have no idea they're being fed just so they and their children can be eaten.

The only way to avoid this kind of thing is to turn off your big human brain and go back to ape tier. We might need to go farther down the tier list than that though https://en.m.wikipedia.org/wiki/Gombe_Chimpanzee_War