How does Ralph's waning confidence in himself show in his words or actions?William Golding's Lord of the Flies

In Chapter Seven of Lord of the
Flies, Ralph begins to have misgivings about his ability to lead the boys on
the island.  As the boys continue their pursuit of the beast, and they stop to
eat, Ralph becomes aware of his dirtiness and long hair--symbolic of their
degeneration:

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He discovered with a little fall of the heart
that these were the conditions he took as normal now....faced by the brute obtuseness of
the ocean...one was clamped down, one was helpless, one was condemned, one
was--

Realizing that Jack is
in charge of the hunt gives Ralph further cause for reflection.  He recalls events and
circumstances of his life before the plane crash, and how "Everything was all right;
everything was good-humored and friendly," not hostile as he and Jack have sometimes
been.  Then, as Ralph ponders his existing state, a pig runs by and he coolly throws his
spear at it.  Caught in the excitement of this primal activity, Ralph vies for attention
against Jack by declaring that he has struck the pig; "[H]e sunned himself in their new
respect and felt that hunting was good after all." Nevertheless, Jack quickly diverts
everyone attention with the ritual hunt with Robert as the
pig.

As the day wans, Ralph suggests that they relight the
fire while Jack wants to continue.  Ralph asks to be allowed to
think. 

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...Ralph had no self-consciousness in public
thinking, but...he would never be a very good chess player.  he thought of the littluns
and Piggy.

Sensing the
growing antagonism of Jack, he asks him, "Why do you hate me?"  And, the sinister figure
of Roger emerges, posing another threat to Ralph.  So, as the boys continue up the
mountain, "Ralph's eyes were blinded with tears" as the "impervious" force of Roger sits
on the log beside him, banging his wooden stick threateningly.  His inner voice tells
him Not to be a fool," but he feels "green lights of nausea" as later Roger lies behind
him, guarding him.

While Ralph's intentions are good--he
wants to relight the fire and return to the others who wait nervously for them, but his
plans are foiled by Jack's ridiculing and Roger's sinister presence.  Even when Ralph
commits a good deed, his actions go unnoticed, causing him to believe that he is losing
his hold as a leader.