Okay, time for a crash course on financial aid!
Your total cost of attendance (COA) includes direct costs (things you pay directly to the school, like tuition, fees, on-campus housing) and indirect costs (food, books, transportation, etc). Direct costs are things that you're going to definitely have to pay, but many schools overestimate indirect costs just to ensure that you can borrow more money if needed (most loans have a borrowing cap at your COA). So, if your parental + student contribution is $7000, it's a "low" enough amount that it's probably for indirect costs, so you wouldn't pay the school that money anyway. It's how much the school is estimating you should have saved up for food, personal expenses, etc.
I also see that you asked about receiving federal loans -- your financial aid package should summarize all the loans that they have awarded you already. It should include federal unsubsidized loans (Stafford & Grad PLUS) and any institutional loans you received. The list of loans they offer can be found here:
Types of Financial Aid | Student Services
You can also appeal your financial aid award with this form:
http://studentservices.weill.cornell.edu/sites/default/files/appeal_application_form_2017-18.pdf if you think that there was a mistake.
Hope I made sense! Apologies for this wall of text.