Get used to it. If you can't stand having your little brother around, wait till you have kids and see how you like it!
How do I get my little brother to leave my boyfriend and me alone?
Do something utterly horrible to him...
Be having your parents to properly despline him or for you to go somewhere where he is not there.
Lolz hit him or just lock him in the room or just tell him that u will do something for him if he dosent bother u