Why didnt the creature kill himself?

Survival is an innate human drive.  If not, many more
people would take their own lives when pressure arrives.  Victor's creature spends his
first part of his existence longing for Victor and trying to figure out what his life is
about.  He hides and he learns.  He becomes an educated
person.

By watching the family and their goodness, the
creature develops a sense of hope.  He eventually begs them allow him to be part of
their lives when he confronts the blind man.   Hope for a connection to another human
has helped motivate him to survive.

He again has hope when
he demands a female creature to be made for a mate.  Victor crashes his hope and the
creature recognizes that he will be isolated from
mankind.

He replaces hope with anger and begins to seek
revenge on Victor and society for rejecting him.  Victor has abandoned him so he seeks
his revenge in payback of Victor's abandonment.

When the
creature places himself in the frozen wasteland, we know very little of what things he
ahs done to others who live in the wilderness.  We know he has a sled of dogs so the
reader may surmise that he took them and could have harmed someone while doing that
act.

The creature lives because his last hope is that one
day he will be able to connect with his father, Victor.  He needs
the connection and waits for it.  Victor follows him to the ends of the earth with
intent to destroy the creature, but that sense of hope still exists for the
creature.

In the end Victor perishes and it is then that
the creature has lost all hope and a desire to live.