DNS Setup For VPS

initial WHM DNS setup i tryed at first with whm but it seems like it messes the nameservers IPs so i just put some entries manually I got all name servers IPs and shared IP setup right but i may be have some problems with DNS zones
here is my named config

---------------------------------------------------------------------------
view "internal"
{
/* This view will contain zones you want to serve only to "internal" clients
that connect via your directly attached LAN interfaces - "localnets" .
*/
match-clients { localnets; };
match-destinations { localnets; };
recursion yes;

zone "." IN {
type hint;
file "/var/named/named.ca";
};

// include "/var/named/named.rfc1912.zones";
// you should not serve your rfc1912 names to non-localhost clients.

// These are your "authoritative" internal zones, and would probably
// also be included in the "localhost_resolver" view above :

zone "ns1.xxx.com" {
type master;
file "/var/named/ns1.xxx.com.db";
};

zone "ns2.xxx.com" {
type master;
file "/var/named/ns2.xxx.com.db";
};

zone "main.xxx.com" {
type master;
file "/var/named/main.xxx.com.db";
};

zone "xxx.com" {
type master;
file "/var/named/xxx.com.db";
};
};

view "external"
{
/* This view will contain zones you want to serve only to "external" clients
* that have addresses that are not on your directly attached LAN interface subnets:
*/
match-clients { !localnets; !localhost; };
match-destinations { !localnets; !localhost; };

recursion no;
// you'd probably want to deny recursion to external clients, so you don't
// end up providing free DNS service to all takers

// all views must contain the root hints zone:
zone "." IN {
type hint;
file "/var/named/named.ca";
};

// These are your "authoritative" external zones, and would probably
// contain entries for just your web and mail servers:

// BEGIN external zone entries

zone "main.xxx.com" {
type master;
file "/var/named/main.xxx.com.db";
};

zone "xxx.com" {
type master;
file "/var/named/xxx.com.db";
};
};

--------------------------------------------------------------------------
main.xxx.com is my hostname
I still can't ping main.xxx.com or xxx.com but my name servers are ok
what exactly the problem?