Self confidence workbook, page 18

I am on page 18 of the self-confidence work book, it says to list all the areas where we are self confident and the reason.
As I am writing I am noticing that my reason is the same every time , it is ‘because I have done it before’ or ‘I have past evidence’
which I guess are saying the same thing really.

Should I be delving a little deeper or can I accept this reason and continue? I genuinely think this is my reason for areas I am confident in, but then when I think about it I would have had to always of done something for the first time so my reasoning falls flat here? If I thought back to the first time I would probably say my reason was because I forced myself?