Guild Wars 2

I am completely new to the game, just rolled a Mesmer and have tried my hand at some WvW. It is my understanding that you get a soft boost to 80 in order to be of some worth to your team (my Mesmer is level 20 outside of WvW).

I have tried roaming and doing some 1v1 encounters. It seems like there is no class I can best. I ran into a thief earlier guarding a point, and I believe he was afk at first. It took me 5-10 seconds to get him to about 60%, at which point he must have returned, as he went into stealth, and within less than a second of reappearing on me, I went 100-0.

So my question is, does the outlook get better as you level up/get actual gear?
Or is this what I should expect from GW2 PvP, and just give up before I get too far.

Hey guys, I bought the game when it first came out but am just now going to start seriously playing. I intend to mostly PvP, and would like some opinions on which class would suit me best.

I have it narrowed down to Mesmer, Thief or Necromancer.

I like the idea of being a caster, but thief is still an option as I will mostly be playing solo.
I don’t want to play the FoTM, but I would appreciate some insight on which classes can do well, and perhaps which class has the highest skillcap?

Thanks