my minecraft keeps crashing on my computer when it loads i dont want it to lag soo bad

Put the summary of the bug you're having here

*What I expected to happen was when i ever start the game its loading and it says that it crash and it said that if i report you can fix it right?plz fix it i just want to play minecraft for the first time on the computer.i"v been waiting for two hole years and it still it crashes.plz fix the crash thank you

Describe what you thought should happen here
what i thoght was going to happen is that minecraft was gonna start at the title scren
What actually happened was...:
Describe what happened here
it just said it crashed
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. fix the crash plz and stop the lag
3. i can play minecraft