we don't usually say "self-interesting."

 It seems like you might be looking for the right way to describe someone who is focused on themselves. In English, we don't usually say "self-interesting." Depending on whether you mean it in a positive or negative way, there are much more natural terms to use.

Here is a breakdown of the best alternatives:

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1. Negative Context (Selfish or Egotistical)

If you mean someone who only cares about their own needs or thinks they are the center of the universe, use these:

• Self-centered: (Most common) Someone who only thinks about themselves.

  • “He is so self-centered; he never asks how I’m doing.”

• Self-absorbed: Someone who is so focused on their own thoughts/feelings that they ignore others.

  • “She’s too self-absorbed to notice that the room is a mess.”

• Narcissistic: A stronger word for someone with an excessive interest in themselves.

2. Neutral/Formal Context (Business or Economics)

If you are talking about acting in a way that benefits you (like in a negotiation), use this:

• Self-interest: (Noun) Focusing on your own advantage.

  • “The company acted out of pure self-interest.”

• Self-interested: (Adjective) Motivated by one's own personal gain.

  • “Most voters are self-interested when it comes to tax laws.”

3. Positive Context (Confidence or Self-Care)

If you mean someone who finds themselves interesting or is happy with who they are:

• Self-contained: Someone who is independent and happy on their own.

• Self-aware: Someone who understands their own character and feelings well.

• Introspective: Someone who likes to examine their own thoughts and ideas.

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Summary Table

What you want to say	Recommended Term
"That person is selfish."	Self-centered
"They are lost in their own world."	Self-absorbed
"They are doing it for their own gain."	Self-interested
"They know themselves very well."	Self-aware

[!TIP]

If you literally meant "someone who is interesting to themselves," the most natural way to say it is: "He's very into himself" (usually a bit of an insult) or "He enjoys his own company" (a compliment).

Would you like me to help you write a specific sentence using one of these words?

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