Editor's note: We asked noted entrepreneurs to reflect on what they wish they'd known starting out and to put it in a letter to their younger selves. Aaron Aders founded LEIF Technologies, a company that builds electric skateboards that move like snowboards, and co-founded Slingshot SEO, an Inc. 5000 honoree at No. 53 of the fastest-growing private companies in the U.S. in 2011.

Dear Aaron,

This is a note during a time that you need it the most -- you've just graduated from college. You're fighting your natural abilities at the time, trying to do things that you're just not cut out for, and you don't realize it then.

Here are three things you need to know to get back on track instead of working against the grain.

Believe this overplayed truism.

From your high school graduation to almost every entrepreneur big success story, you've heard the same thing: "Stop worrying about success and just follow your passion." But you're thinking, of course it's easy for multi-millionaires to tell you to stop worrying about success!

And it's true. Sure there are plenty of people who followed their passion and failed, but the only difference between them and success is persistence.

You have persistence, so direct that at something you're passionate about rather than the best market opportunity at the moment. You'll be a lot more persistent (and successful) when you do.

In the face of success, keep innovating.

There will come a time where you'll have hands-down the best solution on the market. No competitor will come close and your prospects will almost not believe your results. When this happens, you'll face a crossroads on innovation.

The adage, "If it isn't broken, don't fix it," will pass your mind, and the success will certainly keep you busy selling. However, the market always changes, and you need to be thinking of how it will change and prepare for that.

You'll mistakenly believe there is no way the market can poke a hole in your product -- but there's always a way. The longer it takes you to find the weak spots in your solution, the harder the fall will be.

Never stop innovating, and always play chess with yourself to discover weaknesses and opportunities against you.

Relax: Everything will be ok.

You got a middle-of-the-pack MCAT score, and Pritzker Medical School is probably not going to open your application. It's difficult to accept now, but you'll understand later.

You made your first dollar at 7 years old, selling arts and crafts to neighbors in your apartment complex. You started a company in high school that became so successful that you moved out at 17 years old. You started another business in college. Why the hell are you studying medicine?

You were born to be an entrepreneur. You are an expert at nothing, but proficient at everything -- and this is the real prerequisite for being an entrepreneur. You're a survivor, so take big risks, follow your passion, invent things and don't worry about success.

You'll survive until then.