"من فقط می‌دانم که وقتی موسیقی می‌نویسم حالم بهتر است"

Simplified Meaning:

When a person says they feel better when they are writing music, they are saying that creating songs or melodies makes them happy and lifts their mood. This can be compared to how some people feel good after they exercise, paint, or do any other activity they love. For example, imagine someone who has had a stressful day at work. When they get home and start playing their guitar or writing lyrics, the stress starts to fade away, and they feel more relaxed and cheerful. Just like how playing sports can make some people feel energetic and happy, writing music helps this person clear their mind and feel more positive. It’s their way of unwinding and expressing their feelings. If you have something you enjoy doing, like gardening or cooking, you probably feel more at ease and happy when you do it. Writing music is the same for this person; it's an important part of their life that helps them stay emotionally balanced and joyful. If someone wants to feel better, they should find an activity that makes them happy and spend time doing it regularly, just like this person writes music.