The thought we had as JWs was that all good JWs did not celebrate any holidays
and
All bad non-JWs celebrated all holidays with fervor and gusto.
Actually, some JWs tiptoe as close as they can to celebrating some, even renaming them, "special day."
In fact, many non-JWs don't celebrate holidays or b-days, not because they think they are pagan, but they lack any interest in doing so. I have non-JW relatives that haven't put up a tree for 30 years...don't want the expense, makes a mess, too much work, etc. Some have a special meal, some just go out, some don't bother.
So you must do what your heart leads you to do.
Blondie