When you receive a 1099-MISC reporting income in Box 7, it means you were not an employee. From the IRS' standpoint you were self-employed and were selling your services to the organization where you worked. The reason you have to use the forms for self-employment is because, if you made over $400, you will now have to pay social security and medicare tax on that income, in addition to income tax.
All the questions give you an easy option, such as you used your own name and address for the company and you did not have an EIN for the company.