im stuck in activication lock,but the worse part is i forgot my id. What should i do

What if I forget my Apple ID password?

If you forget your password, you can reset it at your Apple ID account page or you can contact Apple Support and verify your identity.

If you forget your password and can't reset it, you'll lose access to your Apple ID and might be unable to use or reactivate your device. To help prevent this, visit your Apple ID account page periodically to review and update your account information.

Information above is from this support article > Find My iPhone Activation Lock - Apple Support

Apple ID - How to find your Apple ID

Apple ID - Find

Enter your Apple ID and click Forgot Password,

Apple ID - Manage