It's not healthy or productive to have the mindset that you can never be "good enough" in a relationship. It's important to recognize your own worth and value as an individual, and to approach relationships with self-esteem and self-confidence.
That being said, there are a few common reasons why people might feel like they are not good enough in a relationship:
Comparing themselves to unrealistic standards: It's easy to fall into the trap of comparing ourselves to others or to a perceived "ideal" partner. However, it's important to remember that everyone is unique and has their own strengths and weaknesses.
Feeling like they are not meeting the expectations of their partner: Sometimes, people may feel like they are not meeting the expectations or needs of their partner, which can lead to feelings of inadequacy. It's important to communicate openly and honestly with your partner about your needs and concerns.
Struggling with self-esteem or self-worth: Low self-esteem can make it difficult to feel good about oneself in any situation, including relationships. It's important to work on building self-esteem and developing a positive sense of self-worth.
It's also important to remember that relationships take effort and compromise from both partners. It's not realistic to expect to be perfect all the time, and it's important to be open to learning and growing together as a couple.