I don't know the specifics of what went down with you, so I
can't really opine on the actions of those who killed you, or
their skill level relative to yours.

There are players ingame who are willing to take newbies
(oldbies?) such as yourself under their wing which can help
you get up to speed faster. If you want to try an easier
race/class combo to help you hit your stride, that might also
help ameliorate the difficulties of getting re-acclimated to
the game (I personally do this after a hiatus).

I can empathize with your frustration (I've been there), but
it is a little unreasonable to expect to be competitive with
more experienced players right out of the gate. Sure they used
a few minor preps, but how is a guy who never met your
character before to know you're easy to beat?