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You're the best. My mom added me as an authorized user to a couple of her cards (when I was 12, and she never even told me about it), but they're at 99% utilization and have late payments! I'm still in the process of trying to get myself removed from those, and getting those accounts completely removed from my credit report, not just listed as closed accounts.
With poor credit, you may not be able to get approved for new credit products like credit cards. Although you may still be able to take out an auto loan or a mortgage, you’ll pay a much higher interest rate because of your low credit score. Compared to a borrower with good credit, someone with poor credit can pay $50,000 more in interest on a mortgage. Over an entire lifetime, you could end up paying over $200,000 more in unnecessary interest just because of bad credit.