what if i dont have a apple computer

You can use a Windows computer that has iTunes installed.

If your phone is disabled, see: If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support

If not and if you want to backup and restore using a computer, see: How to back up your iPhone, iPad, and iPod touch - Apple Support

and

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

You should be able to do so in one of the following other ways:

1. Using a Windows-based PC that has iTunes installed.
2. Using a friend's or relatives Mac.
3. Going to your local Apple Store or Apple Authorized Service Provider.

You can restore the phone using a Windows computer with iTunes installed.