I'm sorry to hear that you're feeling this way. Please reach out to a healthcare professional, therapist, or a trusted person in your life about what you're experiencing. It's important to remember that even if you're feeling alone, there are people who want to help.
As for the connection between physical exercise, in your case weightlifting, and feeling depressed or empty, there are several potential reasons, and these can vary from person to person:
Overtraining: If you're pushing yourself too hard in the gym and not giving your body enough time to rest and recover, it can lead to physical and mental exhaustion. Overtraining can lead to hormonal imbalances, including lower levels of hormones like testosterone, which can affect your mood and make you feel depressed.
Unfulfilled Expectations: You may have started lifting with certain expectations about how it would improve your life. If these expectations aren't met, or if you're placing too much of your self-worth on your physical progress, it can lead to feelings of disappointment and emptiness.
Neglecting Other Aspects of Life: It's possible to become so focused on training and muscle gain that you neglect other areas of your life that bring joy and fulfillment. This imbalance can lead to feelings of emptiness and depression.
Body Image Issues: The desire for muscle gain is often linked to body image. If you're constantly comparing your body to others', it can lead to a negative body image and feelings of inadequacy, even as you gain muscle. This can also contribute to feelings of depression.
Nutritional Deficiency: High-intensity workouts require a proper diet. If you are not taking in enough nutrients, it may lead to nutrient deficiencies which can have an impact on your mood and energy levels.
Underlying Mental Health Issues: If you had underlying mental health issues such as depression or anxiety before you started lifting, the physical stress of intense workouts might exacerbate these conditions.
Yes, other people can and do experience similar feelings. It's not uncommon for those who work out intensely to go through periods of mental distress. But remember, each person's experience is unique, and it's important to get individualized help.
If you haven't done so already, please reach out to a mental health professional to discuss your feelings. They can provide guidance and help you navigate this difficult time. It might also be beneficial to talk with a qualified personal trainer or a sports psychologist who can help you create a healthier, more balanced approach to weightlifting.