Sometimes, those who constantly belittle you are not because you're not good enough, but perhaps because you have an "influence" on them. If a person truly thinks you are worthless, they won't spend time evaluating you; they will simply ignore you. Only when you are somewhat "present" will their attitude become complicated, even including suppression, nitpicking, or denial. This can be seen in many scenarios: in negotiations, people will point out the other's flaws to lower the price; in the workplace, some will suppress potential threats; in competitive relationships, evaluations often serve their own interests rather than objective facts. Therefore, praise and criticism are not necessarily genuine; they are more like expressions of "stances." But the key point is, if a person's words are motivated by self-interest, they do not equate to your inherent value. You don't need to live within others' evaluation systems. Listen to feedback, but not be emotionally hijacked; accept advice, but not be defined by it. True stable confidence is knowing: what others say about you does not determine who you are.