Some strong opinions in this topic.
Remind yourselves, this is Early Access. We are all playing a custom made character. The companions in your party are the - as for now, unplayable - Origin characters with a full-fledged built-in storyline. Hence, your custom made character will indeed feel more bland than that of your party mates. Your custom made character will be calling all the shots , though.
Origin characters aren't a good thing for a game franchised as Baldurs Gate. You either end up with a story shoehorned by Larian (Origin stories are totally written in advance, you can't customize much), or with a bland PC with nothing special (Custom made).
Either way, the main story is watered down because it has to fit with both Origin and Custom characters.
Whereas, in the old Baldurs Gate/Bioware games, you had one strong main character, almost entirely customable, along with enjoyable companions who were to remain companions all the way, not characters who would compete for the spotlight because of theses Origin story mechanics.
Usually, games make a choice in early stages of creation : either letting you play whatever character you want and add a strong story on top of it to make it feel special (let's say, Dragon Age Inquisition) or give you a premade character which allows the story to dig deep into what you're supposed to roleplay (let's say, Witcher 3).
Baldur's Gate 3 tries too much to be its own thing, and by not choosing an identity (be it for story or even gameplay with the very questionable choice of merging D&D5 and DOS mechanics), it just makes it bland and forgettable.
