Fearful Pride

Is it pride that closes me in?
This one of seven deadly
that corrupts hearty souls.
An ulcerating tumor pride is.
I don't share my past, my history,
my very self
with many.
To enter my confines requires
explicit trust
a certain character sense
a gamble. Risk from the other side,
demonstrating they care
that one is worth it.
does pride hold me back? over my treasures?
or fear?
are the two synonymous as one?