there is a setting in your duty finder where if you are lead, you can get given dungeons within 10 levels of you.

wont completely fix your issue, but there is no workable way to do what is peeving you and is a baked in game mechanic so even the lower level players have people to play with.

besides, while a bit restrictive, I found it made me a better player by actually trying to do the same, be it healing, tanking or dps... with far less. but thats just me, I like being reminded occasionally I am not invincible.