Line Of Credit

I applied for A Credit line increase and it was not approved by the Bank because of this..PLEASE HELP?
I applied To Credit line increase on Bank of America via online and they were unable to approve an increase because of the following reasons:
-Proportion of balances to credit limits on bank/national revolving or other revolving accounts is too high.
-Length of times accounts have been established.
What do the bank with these?
PLEASE HELP..
I mean, what do the bank mean with those reasons?
The banks are saying that you are using too much of your credit limit. For example, if you have a $1000 credit limit and are using $900 then you are using 90% of your credit limit. Also, they are saying that you do not have that much of a Credit History to trust you with more credit.
Resident Evil 2 OST – Credit Line of Whole Staff ~ Ending Theme (2nd Scenario)