Playstation account upgrade at age 18?

I had the opportunity to upgrade my account about 1 1/2 years ago. I'm aware of the advantages, such as buying independently, of what I get there, but unfortunately I have not found anything on the Internet about my question.

And this is not the main account of the PS4, but just another one, which can only play the games through the "salvaged PsPlus" and the games purchased on the main account.

Would this go away if I upgraded my account so that I no longer have the option to play the games on the main account?

At the moment I actually want to upgrade my account, otherwise I can't change my name tag.

You get "PS Plus Packages" in many games.

There are monthly games that are free for PSPlus members!

You can access the online versions of games like Fifa and Gta5 for example!

You can hand over your controller in Shareplay

You didn't understand my question

No, that won't go away as long as you have activated primary PS4 with your colleague.

Thank you very much.