Hello,
I found the solution somewhere, and didn't remember to post back here :/
How:
-Open up your calendar,
-Go to 'Calendars' (where a list of your google calendars show up)
-Uncheck the visibility of the calendar named 'Phone'
-Make visible the calendar you want to sync with on your google account
Then when you go to create an event in the calendar on your phone, it is created by default into the calendar that's with your google account that you just chose. I found that the phone calendar can't be synced with your google account.
Hope this helps