Is it normal being afraid of flying insects

That's called a phobia and you would need professional help to deal with it

Of course, flying insects are the spawn of Satan! Just kidding. It's a phobia, of course it's normal, and i hate most flying insects too. Just tell yourself that they cannot harm you, take a deep breath and try killing them if you can. Otherwise, leave the room. I still think you should talk about this to someone.

Stay inside. Lock the doors and windows. Problem solved.

So after they are gone you are still scared?=terror. Just start crushing them brutally.

Yes its normal. Everyone's different and has different fears. I'm TERRIFIED of roaches, I will scream like I'm being killed if one gets close to me.