Somehow my hp is less then others how does this come ? Im sometimes more geared then other and the guy has 50 k more hp then me… this alt of mine (my priest) was instanly lvled to 60 with the boost. Could that be the problem ?
While pinpointing the exact reason is impossible without more details. There are quite a few reasons why someone could have more health than you at equal or better/worse gear:
Gear: Some pieces of gear grants more stamina per unit, than others. So might have equal ilvl, yet different stats.
Enchants or gems: Can modify your gear to grant more health.
Buffs: Buffs that modify your healthpool, like powerword:Fortitude, or foodbuffs and the similar.
Talents: Talents can give your HP a boost.
Other misc: Tauren got more health than others, different armor bonuses grant more stamina, specs get different rates of stats.
You did not state why you were thinking about this, but rest assured, nothing is wrong with your character and there is no need to be worried