Retail traders, especially retail day traders, who are self taught via watching internet videos and reading books and articles: A very high percentage, around 95–99% lose money. The IRS calls these traders “Hobby Traders” and that status means that they can’t take off expenses or losses. These traders are basically gambling and thus that is why they lose money.
Those traders who are taught by credentialed educators and have completed a comprehensive course have far more success..
Whether you would be successful or not really depends on your willingness to learn, completing a comprehensive course, practicing in a simulator to gain skills and confidence before risking real money, adherence to a trading plan, trading parameters, and respecting the stock market as a means of making an income, not a get rich quick scheme.
To learn more, please visit my profile page and or consider joining one of my Quora spaces where I post new lessons regularly. Choose a Space that is appropriate for your experience, education and goals.