I like to talk TO myself a lot, haven't answered myself back yet...I've heard you're just crazy once that part starts happening.
Jokes aside, I only will talk about myself if I feel someone is genuinely interested in hearing about it or if I'm asked. I'm a pretty open person and very outgoing, so I don't mind sharing things about myself with others. I will only tell very personal stories to people I am closer with or if I feel that something I've been through can really help/resonate with the person I'm talking with.
Believe it or not, I used to be extremely shy when I was younger. I'm definitely not any longer lol.