If you are playing iron banner then you may be under light other than that titans have alot of oversheilds rn which let's them tank some stuff hunters have good damage resist with stasis an warlock rifts can mean you have to do well over 300 dmg to kill them other than this stuff idk what to tell you most guns require alot if not all your shots to be crits to get the optimal ttk but the real answer is you probably arnt very good compared to the pvp community rn (not trying to take a shot at you) the player base has improved alot in recent years and alot of the casuals have just stopped playing outside of getting there pinnacle I get it there is less in pvp than there was a year or 2 ago less maps less diverse meta an so on but Goodluck guardian I hope things turn around but tbh pvp has become brutal an that's coming from a sweat