No wonder you are tired!
You can reset the admin password: https://www.hellotech.com/guide/for/how-to-reset-admin-password-on-mac
or create your own administrator account: https://osxdaily.com/2017/07/17/how-create-new-admin-account-mac/
I'll clap your stuff so that you can buy your own computer! Hang in there. I know what it is like.