Hi there and welcome Anna,
You will have to use a computer to do the reset, there is no way around this, it is why the passcode is so important to remember.
Once you have a computer available.
Connect the iPad to the computer and open itunes
Hold the power and home button down until you see
"iTunes has detected an iPad in recovery mode..."
Click Restore iPad, let this complete and it will be as new, and you can set it up again
I know you do not want to use a computer or have one, but you have to do this sorry