Shaving your head will change your appearance and will change how strangers react to you, and it may make you feel more self-confident, but it won't make you more mature because after all, it is a "hairstyle" only.  Guys who struggle with MPB often feel better about themselves after going sly, but we all don't become Nobel laureates or great philosophers just because we're bald.
If you don't want to shave, a zero guard buzz will give you an approximation to being sly.  By the way no guy on this forum would disrespect his head and use a disposable razor unless it was a dire emergency.  Wet shaving with a good razor and technique gives a superb, smooth shave that has to be experienced to be believed. Words don't do it justice.