there's absolutely No need to wait with pvp until 80, especially not on a Demo. they are basically born with an instant root, and nowadays, they get a fancy kb fairly early on.
rouges are supposed to give you trouble, they're your anticlass so to speak. they have immunity against all your cc's, so the trick is to cc them when their immunity is down.
soldiers, just watch their cunning deflection, and you're fine. kite them if you need to.
remember one thing. you can sprint for far longer than most others. you don't need your stamina, and a pot will heal it up much faster than those with a larger pool. if you run, most will be stupid enough to run after. then, just kill them, with little or no stamina left there's not much they can do about it.
max your runspeed, and casting concentration, and put some points in hiding aswell.
also, it would help a bit if you post your lvl and specc...
-Naya
EDIT; here is a featcalc, in case you didn't know;
http://aoc.yg.com/feat-planer?class=44