Guild Wars 2

I have been playing guild wars 2 for a couple of months now just leveling, a couple dungeons, some WvW, and about 20 Spvp games on multiple professions (still cant find one that clicks). I want to like this game but I am having a hard time getting used to the spvp and wvw I seem to get burned down very quickly without any time to react.

What is a good class/build to use to get used to the pvp( something tanky i assume)?
How long did it take you to get used to the pvp in this game?

I am coming from WoW where it is a bit slower and you can see cast bars so you know what is getting cast on you.

I don’t understand melee in this game ( I am a warrior). I am mostly referring to dungeons and the amount of damage mobs do. It seems like the amount of damage melee has to take is 10 fold compared to ranged. These bosses have the ability to two shot me but ranged just sits back avoiding red circles with near 100% up time.

I understand how to dodge but that doesn’t help much when i can only do it twice then take one hit and I am at 50% health so I run away let health regen (use bow for damage) rinse and repeat. There are some bosses where it isn’t even possible to melee.

Is this just how the game is or am I missing something? I have been playing the game for awhile but just recently reached level 80. So it is possible I am just missing something big here. If this is how it is let me know so I can start leveling a ranged class.