リア充(じゅう)person who is satisfied with his or her real (offline) life

誰(だれ)もがリア充(じゅう)に憧(あこが)れています。

Everyone aspires to be a person who is satisfied with his or her real (offline) life. {person who is satisfied with his or her real (offline) life}

僕(ぼく)はリア充(じゅう)な人(ひと)が羨(うらや)ましく、妬(ねた)ましい。

I envy people who are satisfied with their real (offline) life, and I feel jealous. {person who is satisfied with his or her real (offline) life}

リア充(じゅう)な人(ひと)はよくその生活(せいかつ)をSNSで自慢(じまん)しています。

People who are satisfied with their real (offline) life often boast about their lifestyle on social media. {person who is satisfied with his or her real (offline) life}

人間(にんげん)関係(かんけい)にも趣味(しゅみ)にも満足(まんぞく)している彼女(かのじょ)は間違(まちが)いなくリア充(じゅう)だ。

She is undoubtedly a person who is satisfied with her real (offline) life, as she is content with both her relationships and hobbies. {person who is satisfied with his or her real (offline) life}

SNSでリア充(じゅう)な人(ひと)たちを見(み)るたびに、自分(じぶん)の人生(じんせい)が惨(みじ)めに感(かん)じます。

Every time I see people who are satisfied with their real life on social media, I feel miserable about my own life. {person who is satisfied with his or her real (offline) life}