You cannot bypass activation lock. I'm guessing you didn't write your Apple ID and Password down when you set up the device? These are critical pieces of information to keep stored somewhere safe for future reference.
On the activation lock page is a hint as to what the Apple ID was when you set up the iPad. It looks something like: j********@me.com (or some variation of that). That would have been your Apple ID. Does it bring back a memory of what it was?
You can use this link to try to recover your Apple ID and Password: If you forgot your Apple ID - Apple Support
If you are unable to recover the ID and Password, you will need to find the original purchase receipt with the iPad serial number on the receipt and present that to Apple for assistance. If however, you don't have the original purchase receipt and you can't figure out your Apple ID, your device will be useless.