Is Peter Quill dead?

Is Peter Quill dead?

While Star-Lord was believed to be dead, he's actually alive and in a mythic dimension. ... Star-Lord has recently died in the Marvel Universe. Giving his life to save the galaxy from a pantheon of evil gods, the loss of Peter Quill tore the Guardians of the Galaxy in two.

Are humans immune to Infinity Stones?

Yes, a regular human can control it's mighty power. While a human cannot withstand the pure energy of the stone, the Gauntlet can be wielded.