Do you actually work for a living? $100,000 a year doesn't equate to $8,333 a month in take-home pay. Try deducting FICA, Social Security, Medicare, and local taxes. That gives you about $4,600 take-home per month. Oh, don't forget insurance premiums and 401(k)/IRA contributions so you can one day afford one day in the far future to retire, so say $4,000 / month take-home.
Rent is more like $3,000 / month, then add electricity, water, trash, insurance, telephone, and Internet.
The rest, if you can find it, can be used to eat. God help you if you need to buy clothes, get anything dry cleaned, buy furniture, pay medical deductibles, etc.