Maybe I won’t use it for anything except getting people’s contact info in these situations.
This is exactly what I did. I posted like three pics of my dog, and put it on private and never really use it except for that purpose.
I have never used any social media before or had an account on anything else, but something changed and people started treating instagram like a phone number, which is weird to me but 
that's the way it is now.
Don't feel like you must do this, but just wanted to say you're not the only person to do no social media, but felt the need to open an instagram 
I'm kind of an old and email was never used for regular chat at like any time lol