I was able to collect getw this definition online:
only a little : not very or not very much. He is not particularly good at math. "Did you like the movie?" "No, not particularly." Link
I think most of the we might be confused and we might not be certain about something, and this makes us not to be particularly sure of what we want to do or how we want to do it.
Not in particular about something is not that one is entirely ignorant. It just means that one is knowledgeable in part and he is unsure of what he knows.
In summary, he might need enlightenment and direction too. This would make him be in particular and very sure of what he wants to do.
Thank you for your time...