Unable to Sync Google Calendar with BlackBerry Curve

Hello experts,
I am using a BlackBerry Curve 8830 and I am trying to sync my calendar to Google Calendar. I've been trying for the past weeks and even tried removing the battery on my device, but it didn't help. Nothing happened if I connect my device to my computer and start synchronizing.
What should I do to fix this? Do I need a new mobile phone to sync my calendar?
