In the games that you try to play, do you always stick to only one class? or do you try out every single one of them?

In almost all games i play i always choose to be a Mage or anything that has something to do with magic and elements. So when I created a character in Ragnarok Online 2 (the warpportal version), i made a magician... but then, there was this other option--- i needed to choose a profession-- artisan, alchemist, blacksmith, or chef.. i chose to be an artisan.. someone who makes light armors and stuff.. but somehow, something feels wrong about it... it feels like i should have chosen to be an alchemist... now im confused... Is there a standard class-profession combination or what not? >.<