Well, personally i think it all depends on what kind of business you want to start,your experience in that field and of course your passion in it. There's a reason why they say,you can't have your cake and eat it. If you have decided to quit your job and pump all your energy,focus and passion on something that is totally beneficial to you and your future...then trust me,you will survive in business.But if you're still hang up on your monthly cheque and fear not having you rent at a certain date come end month,then business isn't for you!
Business is about being bold,believing in yourself and being ready to face the worst. It takes a while to build a business but the long term fruits are very sweet. So,if you think you've got it..then dont listen to people..just DO IT
Nevermind what haters say, ignore them til they fade away - Just live your life