Simply put – you can’t!
You have a bad credit score because you took advantage of a lender(s), and probably didn’t return your previous loan(s). How can you expect someone to lend you money if they know you didn’t pay your previous lenders back?
Would you lend your own money to yourself? Probably not… LOL
You pose a huge risk to lender, and if someone IS willing to lend you money, they will want that monstrous interest rate to compensate for that that risk.
Such interest rates will ruin you financially. Maybe it’s best for you if no one will lend you money.
You have earned the ability to be considered a dead beat borrower, and until you get your act together and can prove that you are trustworthy – no one has any reason to trust your money management skills again.
You must work hard to improve your credit! There is a lot of stuff in this site that can help you.