It all depends on what part of country you living, eg. if you live in Boston area, you have to chip $400 just for rent, if you want a private room, utilities extra........... and if you share with a friend, still gonna be more than $200.
Groceries...... Sure gonna be more than $100.... things are expensive now...... unless you wanna live with occasional Ramen and with daal, Bhat and Chicken. One lb of Goat meat cost you $6.00 and even if you buy 1 lb once a week, $25.00 is gone. 25 lb of rice is now $22.00. Green vegetables are lot more expensive than chicken.
So, $400 total everything included with private room seems preety reasonable if you are living on southern states ( i heard rent is cheaper there, not sure though) heck of deal if it is in cities like Boston.
Trust me, you can no way manage yourself with that money in Boston. Utilities especially heating cost is really high in winter months. If you share wifi through router...... you can get internet cheaper and if you dont want a Cable TV in your own room then Cable bill might also be shared ( assuming one TV in living room). Car insurance again depends on state you living, In boston area..... even if you have more than 6 years of clean driving history, you will end up paying around $100 per month for Full insurance, less than 6 year of driving history or some accident or ticket........ way above $100.
gas depends on how much you drive and what kind of car you drive.....
Tution and health insurance...... you know how much you are paying..... depends on type of insurance and college.

If you dont have to move out...... be proud you are paying for yourself and getting a good deal and still living with your close owns (Home away from home). For me thats agreat deal.
I live with my wife a one kid.......
1 bedroom Apt- $1050 ( trust me it is cheaper one I am getting there is nothing fancy just decent apartment)
Gas and electricity - average of $125 ( runs upto $250 plus in winter and around $80 + in summer)
Cable TV + internet - around $65 (Comcast sucks)
Vonage world premium - $65 ( $55 + tax, Good thing is Nepal land line is free so I dont spend money on Phone cards anymore)
Cell Phone - $55 ( T-mobile 750 minutes + night and weekends 2 lines- No contract- No data plan)
health Insurance- $300 ( $74/week fdeducted from pay check---through employer)- this sucks $200 co-payment if you need to go to emergency room)
No tuition for Now- but will be paying preety soon again.
grocery- $600 + minimum( $150+/ week either on market Basket or Stop and Shop..... Kids are expensive
Car insurance- $92 ( was $62 till last year but had an accident and jumped to $92)
Gas- $100 + per month ( I drive 2010 Corolla and fill once on every 12-13 days)

So, TOTAL is $2450 for 3 bones
Means $800+ per Person......
Total family income less than $4200 per month..... (this is after tax and health insurance though)
Uff....... I forgot to mention Car payment- $277 per month, Credit card payments .......Dont even want to mention (total around $14,000 and i am payikng about $500 per month).
So, I am saving about $1000- $1200 per month now...... and is still keeping creditcard debt ( most of them are running on 0% APR.
Life in America SUCKS but I am enjoying it, especially with my 2 year old one.