How do you know if it’s your clothes or your style?

Hi! I’ve been trying to work on developing my style for the past few months but I haven’t been able to put together many outfits that I love. There are a lot of people whose style I love, but I did notice that I don’t have any similar pieces that could replicate their style (or if it would be flattering on my body). At the same time, I have a ton of clothes, although my parents have bought all of them for me [without me there] over the years and I think I look very average in them (they’re fine for going to classes or running errands, much less fine in more work settings where I’d hope to look more put together). In general, they’re all similar styles, mostly bought because it was on sale or because it looked comfortable, and weren’t really bought with the idea of making a cohesive outfit.

I’ve been very hesitant to buy clothes myself in the past because of either budget constraints or not living near any stores accessible via public transit, but I’m moving soon and these factors will not be the case in another week or two.

My question is: how do I know when my lack of overall style is a problem of my fashion sense being poor and clothes being fine, versus if my clothes are bad/ill-fitting/not my style and my fashion sense is fine? I don’t want to invest a ton if it’s the former, but I keep getting the itch to just dump half my closet and buy a couple of pieces that I like. Can any sane set of clothes be styled well by someone with an eye for fashion?