I just picked wrong adv class havent took any talents yet, is there any way to change?
NO, sorry, thats impossible I'm afraid. You cant pick the wrong advanced class, you've had 10levels of play and the ingame descriptions are flawless and cant be misunderstood. At least thats whatt the "no AC swapping" crowd told us before launch, so you must be wrong, you cant possibly have picked teh wrong AC and want to swap.
Seriously: Nothing you can do but re-roll. Could try a CS ticket, but I doubt you'll get a response right now.