Mindset question: unhappy from procrastination, happy working, but not changing anything

So for context I am currently doing a Masters in Business. I want to start my own business, but I am literally too lazy to put the work in. Instead I waste my time on Instagram and YouTube. This time wasting and procrastination actually makes me very unhappy and tired. At times where I have to study or finish an assignment and when I work 8h a day on university stuff, I am feeling way more fulfilled. So obviously it would be good for me to work on my business. But I just still tend to do nothing even though I know it makes me unfulfilled. I don’t know why I am stopping my self. Do you know a similar situation? What did you do?