I feel exactly like you. My main style ( X ) is pretty cutesie which is annoying. I started to push myself really hard and it has gotten better (but for some things this style actually fits and I actually like it). That doesn´t mean it´s bad at all but unfitting and frustrating when nothing looks like how you imagined it.
For example, my more badass and cool, epic, characters always turned out cute which is just awful, and everyone only associated them with that theme. which.. isn´t surprising at all, but bothering, also for me personally when I view them.
Take this piece for example, just drawn recently. This character is supposed to look hot/epic/wild and not a cute innocent guy or something which I think I managed fairly well. In the past, he turned out more like this which is very unfitting and boring.
I also have the same issue with my animal characters. Take this for example . he is grumpy/mad but it still appears cute, which is mainly because of the shape of the eyes I believe. This has gotten better recently tho. *gore warning
right here the shape of the eyes are more sharp and small. which definitely helps to make the character look more serious. as well as in this one as well.
overall, I´m not 100% satisfied BUT I´m not disappointed in myself anymore. I used to, especially when I didn´t tried new things and stuck to the same stuff.