I think the difference in this post vs the rest:
Most people complain they can't even get into a 10.. this is a MUCH MUCH higher skill cap/ceiling - a 15 is MUCHHHH harder than a 10.
My dumbass only does tens.. unless we like multichest a ten and the group somehow (never) likes my heals - then we do an 11 or 12 (never)
So ON TOPIC: Don't give up OP, keep doing the grind and getting that raider.io up and you'll b in those groups 100%