Is it realistic that an individual could earn enough interest to retire in 10 years? What about 20 years? If the money were invested relatively aggressively with a higher tolerance for risk. What other ways could an investor expect to earn a significant return in 10 years?
At an average 10% return, in 10 years the expected value of the fund will somewhere around $1.4 Million. In 20 years the expected value will be somewhere around $3.7 Million. From there, you could get to a safer return of 5%, which would give you an income of $185,000 per year. I would hope you could live off of that for the rest of your life.
Other than that, what do you want to do? Do you want to get a master's degree and improve your knowledge and income? Great! you have more than enough money to afford to get a degree, and with a higher income you could probably even contribute MORE to your "retirement" fund.
You can do whatever you want at this point. The only risk is that you do something foolish (like blow it on cars and boats, or use it ALL to start a new business that then fails), but you certainly have the ability to do whatever you want.