That’s actually not the worst rate out there Mary, many APRs are in the 18-21% range!
As Taylor said, there is no interest if you clear in full each month but that’s not an option for everyone. In terms of having a card for things like online purchases, Visa Debit cards are a good way. You could also consider the pre-paid type of card like the o2 one that you top up yourself.
One other thing worth mentioning, I spoke to someone recently that had a credit card bill of a few thousand euro but they were also saving €200 per month. As the interest on their savings was only about 2% after dirt, it made far more sense to add the €200 to clearing the debt with the much higher interest rate! When paying down short term debt, the higher interest rates should be paid first to get the best value. Hope that helps.
Dave.