しょうがないなあif you insist (on it)

しょうがないなあ…自分(じぶん)でするよ。

If you insist... I'll do it myself. {if you insist (on it)}

一人(ひとり)で出来(でき)ないの？しょうがないなあ、私(わたし)がやるよ。

Can't you do it by yourself? Well, if you insist, I'll do it. {if you insist (on it)}

素直(すなお)に謝罪(しゃざい)が出来(でき)ないなんて、アイツはしょうがないなあ。

If you insist on it, it's hopeless for him to apologize sincerely. {if you insist (on it)}

会社(かいしゃ)を辞(や)めたなりニートになる怠(なま)け者(もの)なんだから、お前(まえ)はしょうがないなあ…。

Since you quit your job and became a NEET, you're just a lazy person. If you insist on it, then there's nothing we can do... {if you insist (on it)}

姉(あね)が弟(おとうと)に：「え？恥(は)ずかしいの？しょうがないなあ、私(わたし)が代(か)わりに謝(あやま)ってあげるよ。」

My sister said to her brother: "What? Are you embarrassed? Well, if you insist, I'll apologize on your behalf." {if you insist (on it)}