The one profession
My static group has run successful fast and efficient dungeon clears with varying setups (even ran some good runs without having a heavy class in the team). One of my friends runs a ranger and knows exactly what situations he needs to swap weapons/heals/utilities/elites. If you like playing a ranger, don’t let others convince you otherwise. All professions are useful and efficient at some degree in dungeons.
Although I have not played a ranger yet, here’s some things I like about them based on how my friend plays his:
-entangle keeps mobs in place for an important AoE spike
-multiple ways to snare/keep mobs in place
-they are good at killing blossoms with axe mainhand in TA
-whirlwind attack gives a nice vulnerability AoE to help with damage
-they can kite well (this is a viable “tanking” strategy in GW2)
-area heal w/ condition removal
My guess is that most people that are rejecting you are probably stuck with the class role mentality of other MMOs for whatever reason. I laugh when people look specifically for a heavy armor profession and especially when they are still out there after we’ve completed 3 runs of the same dungeon without a heavy armor profession. The roles are more on the players than their profession.
I’d say look for a guild/group that actually understands that dungeons can be run with any profession. With a little adaptation to team strategy, any profession can contribute well. Don’t submit to the ignorance. Only you should decide what profession you want to play. 
Lightrayne well said, you should be a writer your good.
thanks for the advise guys im glad to see there isnt a “one” to play. guess ill keep doing what i do i use the same skills you mentioned except whirlwind i think thats duel axes i like my horn for birds and fury buffs mixed with weapon swap quickness and quickness skill its amazing anyhow thanks everyone