engee,(big sigh)if the sentence used "myself" as an intensifier/for more emphasis, I would most certainly agree with you. Unfortunately, the second application of myself (for emphasis)does not apply in your example
INTENSIVE PRONOUNS
The intensive pronoun has the same form as the reflexive pronoun. The function of the intensive pronoun is to emphasize or intensify a noun or pronoun.
EXAMPLES:
--I myself once faced a similar difficulty.
--She baked that pie herself.
--He himself must make that choice.
--The children themselves decided that a trip to Disneyland would be an unnecessary extravagance.
Engee: A good "test" for proper usage of intensive pronouns is to remove the intensive pronoun (myself, themselves, herself). The remaining sentence should be able to stand alone and be grammatically correct.
If you are suggesting that you used "myself" correctly as an intensive pronoun, removing the "intensive" pronoun from
"It was myself that mattered" leaves "It was that mattered" which illustrates that you are using an incorrect reflexive form.
MISUSE OF THE REFLEXIVE PRONOUN FORM
There are two sorts of errors that people frequently make when using the reflexive pronoun form. The most common error is the inappropriate use of a "self" pronoun where a simple pronoun is called for. The other all too common error is the use of illiterate forms of the reflexive pronoun.
INAPPROPRIATE USE OF THE REFLEXIVE FORM WHERE A SIMPLE PRONOUN IS CALLED FOR
When someone uses a "self" pronoun where a simple pronoun is called for, it is almost always because he mistakenly thinks the reflexive form sounds more "elegant." It doesn't. Memorize this (self-evident!) principle: Incorrect usage is never more elegant than correct usage.
Incorrect
--The boss invited my wife and myself to have dinner with him next Friday.
Correct
--The boss invited my wife and me to have dinner with him next Friday.
(The pronoun "me" is the object of the verb "invited," but since the subject is "the boss," not "I," the object of the verb is not the same as the subject of the verb, and therefore the reflexive pronoun is not needed.)
Incorrect
I'm fine--and yourself?
Correct
I'm fine--and you? (Elliptical phrasing of "--and how are you?")
Incorrect
--John and myself can carry most of the equipment.
Correct
--John and I can carry most of the equipment.
Incorrect
--This is a matter that concerns only you and himself.
--This is a matter that concerns only you and myself.
--This is a matter that concerns only him and yourself.
Correct
--This is a matter that concerns only you and him.
--This is a matter that concerns only you and me.
--This is a matter that concerns only him and you.
REFLEXIVE PRONOUN
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Definition: We use the reflexive pronouns to indicate that the person who realizes the action of the verb is the same person who receives the action. Reflexive pronouns are identical in form to intensive pronouns.
Subject Reflexive
I myself
You yourself
He himself
She herself
It itself
Plural
We ourselves
You yourselves
They themselves
For example:
I cut my hair myself.
* In this example "I" does the action of cutting the hair and at the same time "I" gets the action of the hair being cut.
We defended ourselves brilliantly.
* In this example the reflexive pronoun "ourselves" refers back to the subject of the sentence.
John talks to himself when he is nervous.
* In this example "Himself" refers to John.
Reflexive pronouns always act as objects not subjects, and they require an interaction between the subject and an object.