Is it werid my big brother acts like a body guard? Do any other guys do this to there sisters?is it werid?

When we were young was in line for a ride he had his back to me his arms crossed like a bodyguard and he didn't let anyone next to me and recently we were at a party me and my friends were dancing and he did the same thing he like 6'5 so he's big and tall do any only other big brothers do that or think it's werid I think it's adorable haha