Projecting yourself on to a virtual avatar beyond "this is a tool to interact with this world" is honestly pretty gay, especially so if its not a custom character. You (not you specifically) are not "Master Chief", you're Charles, the fat gay neckbeard working a shitty 9-5 with no real talents, skills or achievements to speak of, and you will never be Master Chief or anything even close to approximating Master Chief.
The people who make themselves as a character in a game with customs are easily the biggest faggots of all. You can be an orc, a nigger, a kitchen appliance, a retarded Second Life werepyre, an Jewish goblin literally anything you can think of... and they pick "Charles, The Fat Gay Neckbeard". Really speaks for itself.