I just bought the game today!
Every time I hit the play button on the Minecraft launcher it says "preparing" then "finalizing" then it starts up a new thing that has a giant MOJANG sign and it gets to 80% then it just crashes. the window says "(Not Responding)"
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[media]

that log says almost nothing
[15:29:51] [Render thread/INFO]: Setting user: ItsGoosie
[15:29:58] [Render thread/INFO]: Backend library: LWJGL version 3.2.2 build 10
[15:30:02] [Render thread/INFO]: Narrator library for x64 successfully loaded
[15:30:02] [Render thread/INFO]: Reloading ResourceManager: Default
[15:30:25] [Render thread/INFO]: OpenAL initialized.
[15:30:25] [Render thread/INFO]: Sound engine started
So it crashes when starting the sound engine maybe?
if so, try reinstalling audio drivers
Tho that might not be the case, due to limited information

Follow the instructions in MCL-6550