I bought the game minecraft. im trying to download it but whenever i press play it crashes i dont know what to do

Put the summary of the bug you're having here

*What I expected to happen was...i would be able to play the game.
Describe what you thought should happen here

*What actually happened was...it kept crashing so i havent been able to play it
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...i dont know how to fix it?!?!