Quit job to start business

I’m 27 and always dreamed about being an entrepreneur of a successful venture and list it on Nasdaq. The problem is that I never really created a successful business only failures to this date, tried 3 times already.

My question is should I quit my job to start a business? I’ve been keeping my 9-5 while testing things on the side, but I always feel like I’m not committed enough hence it will never work. And I feel pretty demotivated in my job.

I have enough to cover my expenses for 5 to 8 years but I don’t want to jeopardise that hard earned money in yet another business venture that could very well fail like the others did.

What would you do?