What's the difference between "thick skinned" and "shamelessness"?

Question

When people say you should be thick skinned, and not be bothered by things people say, isn't it essentially being shameless and confident?

Answer 1

To be thick-skinned means having the ability to withstand criticism.

To be shameless implies unapologetic bad behavior, usually lacking in dignity and self-respect.

I suppose you could be thick-skinned AND shameless.

Answer 2

Thick skinned means to not easily offended.

Shamelessness means feeling no shame and implies a lack of modesty, sense of decency, or regard for others' rights or feelings; impervious to disgrace.

If a person was confident, they would have a "thicker skin".  A confident person in my opinion, would still have regard for others rights or feelings.