It's true that mental attitude is important, but you can still take a rational approach to situations like this. Look honestly at the odds. If you accept them, then cultivate the appropriate mental attitude to help you succeed, but if you do not start with a realistic assessment of the true situation then you are likely to waste much effort trying to replicate the paths that outliers have taken, effort that could have been better spent.

That realistic assessment should start by assuming that in the absence of further data you are a typical member of your class. If you have ideas about ways in which you are different to your class, try to validate them with actual data before making judgements based on them, because another feature of typical members of the human race is that they frequently invent spurious reasons to believe they are atypical.