Use it to reassure someone that you're fine and need no assistance.

Personal Assurance

It's not appropriate for situations where you actually need help.

Not a Distress Signal

It's casual speech, suitable for informal conversations, not formal situations.

It portrays a dismissive or unconcerned attitude towards the needs of others.

It often carries a judgmental tone; be cautious in using it to describe someone.

Use it to critique modern individualism or lack of social responsibility.