You are (I am assuming) and adult. If so, then start acting like one. Be responsible and contact your school and ask for help figuring out where your other loans are from if you can't find any paperwork on them. Get everything together, sit down and figure out how bad it is and then contact the loan companies and try to get the loan payments figured out ASAP, and then make them on time each and every month and pay more than the minimum payment if at all possible to knock them down faster.
Pay your debts.
You really shouldn't be doing any other optional spending until you get the loans back into good standing and at least are able to make the minimum payments every month without fail, but if it was me, I'd cut all other spending to the bone to get those paid off ASAP if any of them are over 4-5%.
You have a hair on fire situation and it can get much, much worse by ignoring this.