It's important to believe in yourself.

She uploaded a selfie to Instagram.

She took a selfie and uploaded the photo to social media.

He likes talking about himself and often talks about his experiences and thoughts.

He set out on a journey of soul-searching.

Since that's his own concern, we better not interfere.

He should stop his selfish behavior.

I went to see a movie by myself.

Watching a movie alone is enjoyable.

Him calling me lazy is truly a case of the pot calling the kettle black.