Yeah, id just switch classes. The storyline around level 15 sends you to visit the other 2 starting cities. Assuming youve completed your level 10 quest from your starting class(required to switch classes), being sent to the other 2 cities is a perfect opportunity to pick up whichever class you want to try next. The game will even give you a boost for doing so - any class you have that ISNT your highest level gets bonus exp. So until your new class overtakes marauder youll be getting extra exp to help catch up.

So did you research the classes a little? If not, you could always pick up multiple DPS classes to try out a little and see which one you like the best. Otherwise, keep asking questions. Someone is bound to have the answers you seek.