Your application could have taken into account the amount of money you made, and what 'they' think you could afford to apply to your education. Back when I applied (in the dark ages, to be sure) I received maximum assistance, but I was also making very little to no money at the time.
Well I'm independent student I just found it weird I only got approved for less than 2 grand. Everyone else I've talked to got approved for way more
Federal student loans are not based on credit or income. They are based on cost of attendance after other financial aid is considered. So, for example, if your cost of attendance is $10k and you receive $5k in grants and $3k in scholarships, the remaining $2k would be offered in federal loans. Cost of attendance is meant to include tuition, room and board (if applicable), fees, and books. Your financial aid offer letter from the school should break out these costs and you should see that cost of attendance and the total aid on offer (including loans) are equal. If they aren't, you'll want to talk to the financial aid advisor to understand why that is as there are some rare and complex instances where lower loans amounts will be offered.