If you don't remember the pattern and if you have Internet access, you can download and install Screen Lock Bypass Pro application from Google Play Store. It will bypass the lock screen and reset/remove your screen lock password, pattern or PIN number. If this doesn't help, I suggest you perform a factory reset using the instructions from its guide. Basically, you need to turn off the device, to press Volume Up + Power buttons and to select Wipe data/Factory reset from the Recovery menu.
