I don't know what to do.'这句话后面的what to do做know 的宾语.是宾语从句、记得小

I don't know what to do (with Myself).
只不过是强调了一下don't know what to do 的无奈的语气

Oh,I like having a job. I wouldn't know what to do with myself if I was at home all day.
啊,我想找个活儿干.要是成天呆在家里.那我就不知道怎么打发日子了.
I swear I don't know what to do with myself.我真不知道怎么样才好呢.

PS:楼下的加上虚拟语气也是对的