Sorry, there are no spells that can physically change your gender. The only option would be permanent surgery, which is not what you want since you simply want to experience it for a day. Magic is hand-in-hand with science. Humans cannot transform into something else or change their DNA.
On the topic of how it feels... Your thoughts wouldn't change if you already had the experience of being brought up as a boy. However, you would have to worry about hormones, menstration, and other womanly things. You're not missing out on anything ;D