I keep Crashing. When Ever I launch minecraft no matter single player or mulitplayer in 15 secounds it crashes I have restarted minecraft and my computer

Put the summary of the bug you're having here
I keep crashing every time I launch minecraft no matter What I do
*What I expected to happen was That I would go on a server and play on it
Describe what you thought should happen here
I would be able to go on singleplayer or mulitplayer and play
*What actually happened was I crash every time I lanuch it
Describe what happened here
I lanuch minecraft and every 15 secounds I crash prior to launching it
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ... login
3. ...go on a server
4. Crash