The speed of sound through air is about 340 meters per second. It’s faster through water and it’s even faster through steel. Light will travel through a vacuum at 300 million meters per second. So they’re totally different scales. No information can propagate faster than the speed of light. If you have light that’s going through a media, it can travel slower than that. But the speed of sound and speed of light are totally incomparable.
Yes, bcs your scream would travel in your frame of reference. When your scream slowed down, it would be 100,000 years old, and everyone it knew would be dead.
No
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