If you have negative information on your credit report, it will remain there for 7-10 years. This helps lenders and others get a better picture of your credit history. However, while you may not be able to change information from the past, you can demonstrate good credit management moving forward by paying your bills on time and as agreed. As you build a positive credit history, over time, your credit scores will likely improve.
Credit scoring models usually take into account how much you owe compared to how much credit you have available, called your credit utilization rate or your balance-to-limit ratio. Basically it's the sum of all of your revolving debt (such as your credit card balances) divided by the total credit that is available to you (or the total of all your credit limits).