Forgot my passcode

Do you see something as shown in the pic below?

In that case...

Following this process is the only way out. The steps given in this link will help you reset the passcode -> If you forgot the passcode for your iPhone, iPad, or iPod touch, or your ...

Regarding your data, If…

• You have an iCloud or iTunes latest backup, then there is nothing to worry about. 
• You have not backed up or do not have the latest backup, nor imported nor you have synced nor uploaded your data to cloud drives prior to the situation that you are in, then I am sorry, all your data is lost.

If your phone is disabled, it is too late to save your data. You need to restore it and then reload your most recent backup. Start here: https://support.apple.com/en-us/HT204306