Naivety. Granted, we all start out sort of wide-eyed and gullible, but the sooner you convert that to savvy and skeptical, the better your chances of coming out on top. The reason is simple: suckers and fools don’t win. Learn to question everything you read and hear and always consider the source.

Panic. High-pressure situations are common in the business world. Things almost never go according to plan and oftentimes they go terribly wrong. It comes with the territory. If you can’t override your adrenaline response and remain calm in a crisis, you’re sort of screwed.

Fanaticism. Passion is a big success driver, but when you cross that line and become over-the-top fanatical, that works against you. I’ve seen it time and again. It leads to a skewed perception of reality, flawed reasoning, and bad decision-making.

Laziness. Those who are driven to achieve great things also know one fundamental truth: It takes hard work over the long haul. That’s why they’re always so focused and disciplined. Most people are slackers. That’s why most people don’t achieve great things. Simple as that.

Quick-fix mentality. Steve Jobs said, “Half of what separates the successful entrepreneurs from the non-successful ones is pure perseverance” and if you’re not passionate about what you do, you won’t stick with it. Too many people want instant gratification these days. That’s not going to cut the journey short but create other problems.

Acting out. Whatever feelings you have trouble dealing with – jealousy, shame, inferiority, entitlement – transferring them to people you work with and acting out in anger won’t just make you and everyone around you miserable, it’ll kill your career, too.

Selfishness. If you act like the world revolves around you, you’d better have the talent to back it up. Even so, being overly self-centered will diminish your effectiveness. Business isn’t about you; it’s about business. It’s about your customers’ experience with your products. Remember who serves whom in the relationship.