You can be discouraged by failure, or you can learn from it. So go ahead and make mistakes, make all you can. Because, remember that's where you'll find success - on the far side of failure.
If you want to increase your success rate, double your failure rate.
Follow the path of the unsafe, independent thinker. Expose your ideas to the danger of controversy. Speak your mind and fear less the label of 'crackpot' than the stigma of conformity.