I'm not 8 years old but there was an 8 year old boy back around the year of 1996 or so named Tommy that was forced by his parents to wear diapers and was treated like a baby with bottles, pacifiers, highchairs etc.
Below is a few pictures of him and so you're not the only 8 year old that is going through diaper punishment.
Here's a few pictures of a boy of about 8 years old named Tommy that was made to wear diapers and a shirt around the house.
In those days the diapers were thick plastic backed diapers and more noticeable but today diapers are hardly noticeable.