The value of gold and silver wouldn't exist, or at least wouldn't matter, if there were no humans reasoning about what to consider valuable. To put it another way, value is always a matter of subjective thinking of every single individual. Bitcoin has certain credible characteristics because some individuals decided it is worth mining it and holding, and vice versa, some individuals think it is valuable because it has those credible characteristics.
I totally agree with what you just said, because the gold and silver we all refer as store of value today was given that preference due to the fact that they are scarce, durable, divisible and generally accepted, of which people saw that it could be use as a medium of exchange, of which Bitcoin today also has same qualities of been scarce, durable, divisible and generally accepted as a stors of value and means of exchange. So why can't it be called "Store of value" when they all has almost same qualities?