I write a lot about creativity and passion on this platform, which might or might not make it seem that that's all I'm really writing about: creativity and passion. But ultimately, what I think I'm really writing about is: identity; the continual pursuit of understanding who we are as individuals that are part of this world, and how we, as individuals, might think and act in ways that introduce positive affects and outcomes into the lives of others and our own.
Which is to say, a significant part of being creative and being passionate about something, anything, is having a relatively clear sense of one's own identity and being able to express that sense of self in the world in unique ways.
I'll give you an example if I'm not making sense here...
I have always been attracted to, interested in, and (somewhat) adept with things like stories, music, media, and verbal communication. Therefore, I work creatively within these disciplines, but my work within in them are simply expressions of deeper traits in my identity: I tend to be very intuitive, strategic, emotional, verbally communicative, immediate, and outside the book when I think about or do anything in life (e.g. making a meal, attending a social gathering, greeting a stranger, designing a workspace or home environment, getting groceries, and so on. Literally, it's impossible for me to do anything without reinventing the gosh-darn wheel. Just ask my wife).
Consequently, I know what I'm creative with and passionate about because I have, to a certain degree or another, developed a sense of self over the 29 years that I've been alive — which isn't to say that I have myself all figured out, because I don't. But the point remains: to be creative and passionate, we have to be willing self reflect enough to decide what we're going to be creative in and passionate about.
The logical conclusion one can draw from this, then, is if you say "I'm not creative" or "I don't have any passions," than it might be because you haven't developed an understand of who you are yet; that it might be good to start with reflection on who you are as an individual to figure out how you might be creative and passionate. That is, think about how you are wired emotionally and intellectually; how you tend to problem solve and interact with other people; whether you like to use your right brain or your left brain more than the other; and so forth.
Indeed, I think a predominant reason why people don't consider themselves creative or passionate is because they simply haven't discovered who they were made to be yet.