Question:
Could it be that I'm not actually depressed? Could it be that life is actually boring and meaningless?
Answer:
No, you're wrong. It is depression that makes you feel empty and unhappy. It is depression that makes you feel a lack of meaning in life.
This is actually the mechanism of depression: after several months of depression, your brain undergoes changes. The hippocampus, which controls the formation of new memories, is damaged, and the rate at which your brain produces new neurons slows down significantly. This means that even if you have positive experiences afterwards, it is difficult for these positive experiences to be converted into new positive emotions and memories. Additionally, you will find it difficult to learn new knowledge and become trapped in your old thoughts and values.
Because new experiences are difficult to convert into emotions, you are prone to thinking that "life is boring/life is meaningless." Furthermore, because you are trapped in negative feelings and have difficulty receiving new information generated by your brain, you are likely to repeatedly reinforce your negative feelings and thoughts with old information, rather than gradually eliminating these negative feelings.
Do not think that you have discovered the essence of life. It is your brain that is malfunctioning, making you perceive emptiness/boredom/lack of meaning as the essence of life. What you need to do is to fix your brain: take medication, exercise, rest, meditate. These activities can slowly repair your brain within a few months.