only received 5k in federal unsubsized and subsidized loans what do i do??

My school is 36k a year (in state, this includes tuition and non tuition cost) and I received about 15k in scholarships and Pell grants. The remaining is 21k but fasfa only gave me 5,500 in loans and expects me to pay the rest which is 16k out of pocket?! Am I able to request to take out more in loans?? To put in perspective I'm first Gen, and my household income is around 80k with my dad being the sole provider (mom passed away) and I also have 3 other siblings which fasfa knows all of this?? So I'm just confused pls help I'm scared and anxious