My Minecraft won't load up and says i don't have ram and just crashes

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
For minecraft to load up like normal
What actually happened was...:
Describe what happened here
the game crashed
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...load minecraft
3. ...wait for it to crash and say "you have no memory left"