a cross to bear

a cross (somebody has) to bear

  (British & Australian) also a cross (somebody has) to carry (American & Australian)
an unpleasant situation or responsibility that you must accept because you cannot change it
Usage notes: In the past, criminals were made to carry crosses as a form of punishment.
Someone has to look after mother and because I live the closest it's a cross I have to bear.
See also: bear, cross