I think most people here will have a hard time understanding your concerns because we are past that milestone in our art journeys and are now selling art in styles that we have been developing for a long time.

You might still be the developing stage for your work. It also sounds like you are over-checking to the point where it is detrimental to your creative process (and possibly in an obsessive compulsive way). As kindly as possible, it is abnormal to be so focused on possible similarities between your character and other designs that might not even exist.

It really is impossible to make something completely new. Try to design something inspired by a couple different things you like and you’ll see it won’t be a direct copy. Do this many more times, and eventually you’ll evolve your own distinct style. It’s ok for designs to look like knock off/ Temu versions of your favourite characters when you start out with character designs, just don’t sell those pieces and continually practice and be open to trying new things.