I can understand why so many people who identify as introverted can find this a bit frustarting but hear me out. I'm an introver myself and my closest friends are extroverts and something I've noticed in manga like these with "introverted" main characters they're usually not necesarily a natural introvert but rather just them displaying self protecting behaviours born from traumatic social experiences and sometimes I find myself with the same issues but here's the deal, I've went from being a reclusive and depressed introvert to a ambivert I was so head set on trying to avoid social experiences and relationships because of fear and social anxiety that I never bothered trying to step out of my confort zone and doing so for a LONG time can be quite harmful for your mental health after all humans are social creatures by nature, my friends who are significantly more social than I am created safe opportunities for me to interact and meet new people while also respecting my boundaries and it has helped me grow significantly as a person, yes I'm still half an introvert and get drained from socializing and shy around people sometimes but I went from not being able to even order my food at a restaurant to actually be able to start a conversation and even expressing physical affections to those I'm comfortable with. Sometimes you need someone to nudge you out of that fear cycle