Not stupid and anxiety, even anxiety disorders are a thing. Question: do your upper traps feel panfully tense? For me yes and I have this impression it may be caused by anxiety.

IMHO neurotransmitter balance, either naturally or achieved with e.g. meditation. Anxious people are a bit too tuned for fight-or-flight etc.

AFAIK cortisol is largely responsible for it.

Things that work for me:

• L-Theanine, suntheanine, it works really well, people use it reduce social anxiety but it seems to work for all kind
• Magnesium with vitamin B! where i live the product is called Magna B6
• less caffeine or none
• more sleep
• exercise, not necessary boring stuff, actually fun sports
• fewer blood sugar spikes