i am indebted to my bank ,what does that mean?
It means you owe the bank money.  The bank is the lender or creditor
so do i have an obligation to repay,since im not fully aware of my debt portfolio
Yes, if you owe the bank money, you need to pay them back.  It's a moral obligation.
well,there was no collateral demanded,it was given based on personal grounds you know
What kind of debt is it?  There are several kinds, such as mortgages, notes, bonds and loans.