Answer:
"What if I can't make it?" I told myself/ I told myself, "What if I can't make it?".
Step-by-step explanation:
Direct speech is the form of speech that is written in quotations or within the inverted commas. They are the speech as said in the original, not something that is changed or relayed as an indirect speech. They are the exact speech as said by the real speaker, put within inverted commas.
The given sentence is written in indirect speech-
Then I told myself what if I can't make it.
This can be written in the direct form as
"What if I can't make it?" I told myself
or
I told myself, "What if I can't make it?"
The use of the direct words, as well as the quotation/ inverted commas (“ “), denote the direct speech.