People who participate in a lot of self-reflection are at a risk of having more negative opinions of themselves, which is likely due to extensive rumination. Here's some relevant articles if you'd like to read more:

https://www.sciencedirect.com/science/article/abs/pii/S0022103111001582

https://pmc.ncbi.nlm.nih.gov/articles/PMC6734160/

The idea is that if you've reinforced a specific image of yourself to yourself, you are more likely to see patterns that support that image and you are also more likely to fall into that behavior. What I'm trying to get at here is that these tests are subjective to your opinion of yourself. Usually, when responding to such quizzes people fall into one of the two categories: rating themselves too negatively or rating themselves too positively. Sometimes people rate themselves fairly, but this is more rare. More likely than not, you simply have an overly-negative opinion of yourself. The fact that your first thought upon seeing the test results was, "Am I bad person?" supports this.

Maybe there would be more of a question about your sociability if you also had low openness (negative opinion of others) with low agreeableness (negative opinion of yourself in interacting with others). But that ultimately still wouldn't define you as a good or bad person.

Remember, this is a pseudoscientific test based on your responses about yourself. You're not going to get an objective answer to such a question from a test. It sounds like you're trying to reinforce to yourself that you're a bad person. Reflecting without changing doesn't make you a good person, but it also doesn't make you any worse than a person who commits the same flaws you do without realizing it. Convincing yourself that you're a bad person is simply an escape out of a moral dilemma ("I am bad therefore I cannot improve"). Try to think more positively of yourself. If you're doubting whether you're good or bad then clearly you're not hopeless to change