I just read something about formal and informal “you” in language, how do people perceive them, and how do they feel when it’s used, misused, or not used.

Now, there’s no formal you in English; you say “you” to everyone. There is in my language, though; informal you is “ti” and the formal one is “Vi”. I can feel the way people see me based on which “you” do they use. Among younger ones, formal you is used with adults, older people, or someone with some authority, like doctors, cops, etc. With fellow young ones, informal you is always used.
Adults use formal you with each other if they’re strangers, but never with kids.
When I thought about it, I’d feel very uncomfortable if I got informal with an older person, even if I know them well. It’s just rude, it’d mean I see them as my buddy or something. In the same time, if someone my age or younger got formal with me, it’d seem like they concider me old. If an older person uses informal you, it seems they still see me as a child they don’t need to be formal with. At the same time, getting formal with someone my age or younger is equally strange and out of place to me.

I was wondering, since there’s no formal you in English; do you still feel formal when you meet someone older, or someone you don’t know well? Are you informal with a child? Or do you see people the same way, regardless of age or how well you know each other?

If you do feel formal, how do you express that? Do you expect formality from other people?