i dont have a mac book or a pc or any type of other computers

If NO access to a Mac or Windows computer, you will have to seek help from a good friend or family member, with a full Mac or Windows PC, to help you out

OR

Search online to locate and call contact your nearest, “local” Apple Store location to try/attempt to make an appointment to get your Apple iPad upgraded/updated to its latest iPadOS 15 version.

Apple Store employees will be glad to help/assist you.

Best of Luck to You!

You buy or borrow a Mac or Windows system, or you work with a trusted friend or acquaintance with one, or you work with Apple or an authorized repair provider.