Guild Wars 2

Hello everyone,
so i’m kinda new in guild wars 2 , i start to play as free to play players , but when i play it i buy HOT coz i love the game, and i start with warrior , but when i play him like 300 hours i see it’s kinda boring.so i wanna ask advice , what class i should play that have much more options to play ( in PvE )., i wanna try enginner or mesmer coz they seems have much more things, seems they can go for condition dmg and pure dmg., and since i never saw that thing like enginner in some mmrpg games so i really want try it , but i hate hammer on enginner , so i still in HOT can use like rifle or pistol and be still good ?
try help me , decide what class should i go.( p.s i dont need OP classes im thinking about enginner,mesmer or necro since i almost play only PvE).

Thanks for attention