Summer is still going strong but so should your savings. But saving too much for the wrong reasons can hurt you more than it can push you forward.

1. Skipping your annual physical
   Many times preventive healthcare is entirely covered by your insurance, but even if it’s not, paying a co-pay is a small price to pay to make sure your health is on track. It can be a simple blood test. Otherwise, you might develop serious health issues that will be more expensive to treat in the long run. So don’t skip out on your next check-up.
2. Skipping your routine oil change
   According to AAA, how often you need to get an oil change will depend on your car and the type of oil you use, but cars that use modern lubricants typically need an oil change every 5,000 to 7,500 miles. Skipping this routine service can lead to the need for more costly car repairs down the line.
3. Opting out of health insurance
   You might not think you need health insurance if you’re in good health, but you’ll regret skipping out on the monthly payment if you get hit with an extremely high medical bill in the case of an unexpected health event. Better be safe now; check with your employer with their plans that best fits you.
4. Doing major home repair by yourself
   You can probably handle giving your wall a fresh coat of paint or installing a shelf. Still, major home repairs — especially those that involve plumbing, roofing, and electricity — should be left to the professionals. Attempting to do these repairs yourself could lead to more damages than you expected.
5. Flying a budget airline
   You might save on the upfront ticket cost, but budget airlines tend to nickel-and-dime you for things that would be included in a standard airline ticket, like having an assigned seat or being able to bring on a carry-on bag. So in the end, you could end up paying more once these extra costs are added in.
6. Eating fast food
   Ordering off the dollar menu can be tempting when you’re trying to save money, but making fast food a significant part of your diet can affect your health in ways that become costly to treat. According to The Washington Post, the long-term health risks that can come with eating a poor quality diet of junk food include a higher risk of digestive issues, heart disease and stroke, type 2 diabetes, cancer, obesity, depression, and other illnesses.
7. Buying something just because it’s on sale
   Finding a good deal on something that you truly need is a great way to save money. But buying something just because it’s majorly discounted means that you’re spending money you wouldn’t have otherwise. So before you buy something off the sale rack, take the time to think about whether or not you actually need it or are just giving in to an impulse buy.
8. Buying perishable items in bulk
   Even when Costco has that sale, if you buy something in bulk and end up throwing a lot of it away because it expired, you’re not really getting a deal. Only buy in bulk what you know you will use, or stick to only buying nonperishable items in bulk to be safe.
9. Applying for a store credit card
   Retail workers will often try to tempt you with a big discount if you apply for the store credit card. However, retail credit cards have notoriously high-interest rates, so the interest you pay on the card can end up canceling out any initial savings and spending more than you initially spent. If you are looking for a credit card to save you money, consider a credit card with unlimited cash back rewards or a low fixed rate.
10. Skipping credit card payments
    If you can’t realistically cover all your bills, try to prioritize the payments that will come with a high-interest rate first. This means you should be paying as much of your credit card bill as you can. Skipping a payment can not only lead you to pay more in interest and ding your credit score as well. Minimum payments hurt you in the long run.

Reference
https://www.msn.com/en-us/money/personalfinance/50-terrible-ways-to-try-and-save-money/ss-BB1bjCWH.