Actually without proper money management even the best strategy would yield poor result. Money management begins with determining the lot size or allocation of capital to a trade. This is followed by assessment of risk to reward ratio and usage of stop loss and take profit facility. Unless and otherwise a trader is adept in all the criteria mentioned above, it would be very difficult to come out successfully in the long term. Very few traders are exceptional in money management and so they perform exceedingly well than others even when similar trading strategy is used.
To change your trading result, just change your thinking.