Dear Mojang, everytime I enter in minecraft, it keeps saying your game has crashed , and i dont like that because now i cant play with my friends. So please help me i dont know what to do!

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...