The opposite of "Imposter Syndrome" is feeling like you can accomplish anything

 However, for most people you cannot do anything but you might do some things really well. However, you don't know until you try. This is the thing.

There is a perfect entrepreneurs statement for this: "NOTHING VENTURED NOTHING GAINED".

In other words unless you at least try to do something you are interested in doing you have no one to blame but yourself.

Also, another thing about almost anything in life: "Most people don't succeed at the first business or first relationship in their lives."

It's just that this is how life really is: You usually don't succeed at your first business venture simply because the odds are against you succeeding the first time out. This is why borrowing 100,000 dollars for your first business venture isn't usually a good idea (unless you are incredibly rich to begin with).

It's better to start in your garage like Steve Jobs and others started and slowly build up from there or something like that. This way you are learning as your business is growing and you are less likely to fail this way long term.

Relationships are like this too. When you are too young you really usually don't know yourself or your significant other that well so the likelihood of keeping a relationship the rest of your life if you are under 20 to 25 years of age is very low. Above 25 you still only have a 50-50 chance of keeping that relationship ongoing as well. But, below 20 to 25 your changes are 25% or less usually because you don't have enough experience in life to pull it off long term yet usually(unless you have a whole lot of help from family and friends. And even then that might not work.