I'm going to quit my job today
Don't you need the income from your job?
I do but I can't stand this job anymore.
It is ok to quit a job you do not like. But make sure you have another job lined up already so you can keep up with expenses.
I can invent something or start my own company. I'm just waiting for a great idea to come around.
Those things take time and resources to start. There is no guarantee that they will take off. Make sure you have stable income before quitting.