That it were so simple... There is utility in people pleasing that does not end with self-satisfaction. There are costs, sometimes immediate, to conveying your thoughts and feelings directly. Examples from the workplace: Your colleague is a bit chatty and annoying, so the last thing you want to do is start a conversation about how bad your weekend was. It takes more mental energy to deal with them than not, so smile…
Have you ever met the person that, as soon as you say you went skiing once, starts saying how much they love skiing? Then later you see them do the same thing, but this time it's about traveling, with someone else. And later, you invite them to your ski trip (could be months or years), and they say, "I don't like skiing."? They were gushing about it when you met, but it was a complete lie. They may have even repeated it a few more times, but one day they forgot.
That's the extreme people-pleaser. They're never honest with other people, and consequently none of their relationships are real. They're all predicated on falsehoods (what they like, what they don't like, what they're interested in, etc.). So every time they go out they have to remember what lies they told this group, and oh shit now two groups are meeting and they have two conflicting lies.
What you're talking about is not this. False bravado or confidence is sometimes what you have to do to make it through. But make it a perpetual thing, in all situations, it either becomes true, or it wears you out.