If I want to cancel an annual creative cloud membership, I've had for just over a year (renewed on feb 18th 2015), if I cancel it before the first renewed month, (march 18th 2015) will I still be charged the remaining 50% of fees for the year? Is there any way to cancel on my own or do I need to use Customer Support?
This is an open forum, not Adobe support... You need Adobe support to cancel a subscription
-start here https://forums.adobe.com/thread/1703848
-or by telephone http://helpx.adobe.com/x-productkb/global/phone-support-orders.html
--and two links which may provide more details, if the above links don't help you