If you can't find the energy to put in in several hours a day at domaining while you hold a job, you certainly won't have the energy to succeed on your own. You are young, and can afford to lose a little sleep if it means getting ahead.
Lot's of people say "If only I could quit my job, I would have the time to.... (write a book, start a business, become a professional artist, etc.) Some do quit their job. Almost none succeed. They squander their savings and never accomplish their goal.
That's an expensive lesson. A year of life gone, money gone, and all they've learned was that they were making excuses and daydreaming before. Don't do that.
Learn to focus now, and to make the most of your time while you have a job. Only after you have learned that will you be able to quit your job and be successful on your own. How do you use your time, except for the 8 hours at the office? If you are too tired to use your free time, why? What happens to the 16 hours each day you are not working at that job you hate?
