Like my title says i cant use my data im paying for. the way i can use the intereb is from a public wifi
No one has an idea what phone you have. Generally, for things like this, people recommend trying these steps:
1). power down the phone
2). remove SIM card
3). wait 5 minutes
4). re-insert SIM
5). power back up the phone
with WiFi off, yes, you should be able to browse the web via the cellular connection. If you have WiFi on, and you are connected to an access point (router), it should default to using that radio to browse the web...
If the steps above don't work for you, you may have to either:
1). call VZW and have them check your account. tell them that you did the above and it didn't work.
2). go into a CORPORATE VZW store and request a new SIM card be installed in your phone (and don't leave the store till they verify operation works for you).