If you really are age 16, I understand where you are coming from - even if it was nearly half a century ago that I was your age!
However, do a search in these forums on Rex and any other company you may be interested in. You will soon learn that Rex pilots in particular are not a happy group of campers. Do not part with any money for so-called 'cadetships' with ANY operator until you really do your homework.
But when you trawl through the forums and read lots of negative stuff, don't be disheartened. Despite the whingers and whiners out there, flying still beats working for a living. Just be careful to pick the right path.