When I launch Minecraft and join a world or server i crash

Put the summary of the bug you're having here
When i launch minecraft and join a world or server I crash
What I expected to happen was...:
Describe what you thought should happen here
I thought i would just join the world or server
What actually happened was...:
Describe what happened here
I crashed and was brought back to the launcher
Steps to Reproduce:
1. Start Minecraft
2. Join a world or server
3. Crash