Hi @Alias309, I am sorry to hear that. 
Do you remember if you had the chance to activate the myXperia service? If so, try logging in to myXperia here: https://myxperia.sonymobile.com/
Once logged in, choose your device and then choose Lock, you may now enter a new PIN which will be sent to your device. My suggestion is that you also enter a message so that you can see when the new PIN has been sent to your device, as the PIN has been changed once you can see the new message. Once the PIN has been sent, try unlocking your device.
If you still can not unlock the device and don't remember the pattern lock, then I'm afraid that the next course of action would be a software repair using Xperia Companion. However, please note that this will erase all locally stored data on your device.
Let me know how it went! If my post was helpful, feel free to mark it as the accepted solution and kudo it so that other users may find it! 
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