I think the usage of reflexive pronoun "myself" in the first sentence is incorrect.
The first sentence is indeed wrong: "myself, " as a reflexive pronoun, has got to refer to the same entity as another (pro)noun phrase in the clause that it occurs in.
<the dog hurt itself> "dog" and "itself" are co-referential
<they amused themselves with cards> "they" and "themselves" are co-referential
<I disgraced myself> "I" and "myself" are co-referential
All three of the careted sentences are good English; your first sentence is, as you point out, not.