Is it possible to allow sideloading and keep users safe?

I create apps just for myself, just started learning, self taught, not a student taking programming course in university, not professional

Apps created by me for my routine,

Does that mean i would not be able to install my apps ??

No, you "just" have to show Google your ID and cryptographically make sure Google knows the apps belong to you

Congratulations, aspiring developer and solver of your own problems.

Please read this primer on applied cryptography and hand over ID and personal information to be able to be "managed" within the ecosystem in which you aspire to be more competent.