A whopping 76% of Americans have "at least one regret" about the way they've handled their money, according to personal finance website Bankrate's May Financial Security Index.
The study includes more than 1,000 respondents.
Of those with a financial regret, 56% say it has to do with savings. That includes 27% who say they didn't start their retirement savings soon enough, 19% who didn't contribute enough to an emergency fund and 10% who wish they would have saved more for their children's education.
It's apparent that "regrets about savings are head and shoulders above other regrets — even about debt, " Greg McBride, Bankrate chief financial analyst, says in the report. "Americans are under-saved for both retirement and emergencies, and are increasingly aware of it."
Perhaps not surprisingly, baby boomers, ages 55 to 73, were most likely to cite not saving for retirement early enough as their top regret, as 33% chose that option. That's compared to 23% of those in the Silent Generation, ages 74 and older, and 22% of Generation X, ages 39 to 54, who say the same.
As for younger generations, most regret not putting enough money toward an emergency fund: 19% of both older millennials and those Gen Xers say they wish they would have saved more.
Other studies draw similar conclusions: Northwestern Mutual surveyed more than 2,000 U.S. adults and found a third have less than $5,000 stashed away for retirement while 21% have nothing saved at all. According to the Federal Reserve, a third of Americans don't have enough to cover even an unexpected $400 expense without selling something or borrowing money.
Still, retirement savings and emergency funds aren't Americans' only financial concerns. Per Bankrate's findings, 16% of respondents feel they've taken on too much credit card debt, 11% say they have too much student loan debt and 7% say they've bought more house than they can afford.
Indeed, Americans have an average of $6,506 in credit card debt, Experian data shows; nearly 70% of 2018 college graduates owe an average of $29,800 in student loans; and housing costs around the country continue to rise while wages have remained mostly stagnant for many workers.
The bottom line: Americans are dealing with rising expenses and "most people say they aren't saving enough now or for the future," says Bankrate. That doesn't mean it's too late to start.
"Saving money may seem impossible at times but taking a few proactive steps can safeguard you from potential hardship," McBride says.
He suggests breaking down large goals into smaller ones, like saving a certain amount each month or setting up an automatic withdrawal from your paycheck directly to some sort of interest-earning account.
The good news, however: Of those with a financial regret, 50% say they're addressing the issue.
Like this story? Subscribe to CNBC Make It on YouTube!