Are you not paying off your card every month?
I spent about $3,000/month on my credit card and pay $0 for the privilege. In fact, I earn money from it because my credit card company gives me 1-3% back depending on what I'm buying.
If they're charging you "obscene amounts", then you're either living beyond your means or have a really shitty credit card provider. Any decent provider gives a 30 day grace period on purchases before they start accruing interest, so if you're paying off the card every month (Really, I pay mine off twice a month each time I get my paycheck), you'll pay zero interest.