Forgot passcode

Erasing the phone is unavoidable, but if you have a current backup of your phone, you can use that to restore the data after the phone is erased/reset.

If you don't want to use a computer to reset your phone, you can try using this Apple Support document:

How to reset your iPhone, iPad, or iPod touch when you forgot your passcode - Apple Support

i dont want to i dont have any backup what can i doo

Unfortunately, you have learned a painful lesson about the importance of backing up your phone on a regular basis.

With no backup, you have nothing to restore to the phone after it is erased.