You, of course, have the right to compromise your privacy as you wish-- I blog and post under my real name, which is a compromise of privacy I choose to make-- but not the right to make that decision for other people.
A conversation about you with someone else is not an invasion of your privacy.
It depends what is in that conversation. If someone is rooting around our past in a way you didn't give permission for, that's an invasion.
People's thoughts about you do not belong to you.
No, but those thoughts may not be legitimate. Many people are useless idiots and their opinions are valueless.
If I've offered someone as a person whose opinion I trust, and that person says that I'm an idiot, that's a good sign that I'm doing something wrong. On the other hand, the opinion of some random person doesn't have much legitimacy.
You, of course, have the right to compromise your privacy as you wish-- I blog and post under my real name, which is a compromise of privacy I choose to make-- but not the right to make that decision for other people.