Could it be ME? Our actions affect our outcome.
Are you letting yourself get distracted from your goal? Is your goal clearly defined?
Sometimes we get "analysis paralysis". We over analyze to the point we do not get anything done. Maybe you lack focus, or the belief that you can do it. Whatever is holding you back, you must overcome it.
Think of your day job. How comfortable are you doing that? I bet you have had years of training and experience so that it comes naturally.
This is no different. You have to work at it to build enough confidence that you can run your business as effortlessly as you work at your day job.
The key to staying motivated is to clearly define "WHY" you want to start your own business. For determining your WHY, read this POST.