MYSELF  = (JÁ) SÁM SEBE
I talk to myself. = Mluvím sám se sebou.
I played with myself. = Hrál jsem si sám se sebou.
I asked myself. = Zeptal jsem se sám sebe.

YOURSELF = (TY) SÁM SEBE
You like yourself. = Ty máš rád sám sebe.
You talk to yourself. = Ty mluvíš sám se sebou.
You asked yourself. = Ty ses zeptal sám sebe.