<human>: Hi, I am a 20 year old male who lives at home with his mom, stepdad and little brother who is 12.
This is just a throwaway account because of reasons.

So the story goes that, i've been using a specific online name for about 7 years now. Many people know me by this name and it is very personal to me, notable places I use it is Youtube and every game I ever play.
My little brother started to use that same name for his youtube channel, even though I explicitly told him not to do it and he lied to me and still did it. At my home (even though I am 20) I have no power to change that, so I tried to forget about it since his channel was pretty small. For Christmas, my little brother got a Minecraft account (Because he was stupid and used his password for his profiles name on his previous account, even though I told him he shouldn't use his password as a name). When it came to naming his new account I again told him "please do not use my name", he says he won't and he chooses something that only slightly resembles the name. I brush it off as ok. But when I check my computer after a few days (where I can see his current Minecraft name) I see he changed the name AGAIN to mine, thereby lying to my face again. It is not the fact that it is Minecraft he uses my name, but that he lies to me so many times and takes something from me.

I tried talking to my mom about it, but since she has no insight in games or the internet for that matter, she just gets mad at me. She just uses the excuse that it is "just a game" and "he just likes the name, so let him use it". She fails to grasp that that it feels like he stole from me, and I know my little brother is old enough to understand it.

I really need advice on how to handle this situation, I don't know what to do. My mom is just protecting him now, making it even worse. All my friends i've talked about with it agrees with me, but they have no power to do anything about it.

Condense the text into a few key points
<bot>: Little brother steals my online identity and lies to me several times, mom doesn't understand why I am upset and protects him.