Well, every character an author writes is in some form an extension of themselves, even if just a little.
If your friends see 'you' in the MC while trying to make a distinct character unlike yourself, then you clearly aren't trying hard enough.
Do a character study of a unique person or fictional character and peer into their thought process and habits if you are so bothered by it.
As for me, I already know my MC and several supporting/secondary characters of my story will carry an aspect of my own personality, whether it be the persona I show outwardly or one I hide secretly to myself. I'm not bothered by that fact.
The minimum I would do is give enough distinction between my characters so that they don't all become the same rehashed personality with a different skin, hair, etc.
Think of cultivation stories where every antagonist wants to ruthlessly kill you because you're arrogant; isekai/reincarnation stories where the MC is a brainless walking sack of shit that knows 'no common sense' and relies on a heavy suit of plot armor and OP skills to survive; or a game-type story where only the MC has a system/interface to himself/dungeons and fights alone/has a legendary class, has a sick/dying mother in the hospital, or is paying off a huge family debt, where the debt has almost no bearing on the story's progression...
Apologies, I'm sure you can tell how sick I am of the same rehashed character tropes. Maybe I just need to read better content.