To give up before we even start, using low self-esteem or lack of qualifications as an excuse, is, frankly, gutless. As human beings we are all born … - Will Gompertz

Duchamp is a worthy role model. Added to which he believed passionately that anyone could be an artist and spent his life showing the rest of us how it is done. He chose fine art as the vehicle for his imagination, but his approach could equally well be applied to any area of creative endeavor.
His trick was to spend more time thinking than doing. He would pause for thought and ponder on life and creativity and how things might be. Which is what I’m going to do now.

If necessity is the mother of invention, curiosity is the father. After all, you cannot produce something interesting if you are not interested in something. Outputs need inputs.

The problem is, some of us have either convinced ourselves that we are not creative, or are yet to find our way. Confidence in our own creativity can wane. Which is bad. Confidence is crucial. In my experience artists, like a lot of us, fear being “found out.” But somehow they manage to summon up enough self-belief to overcome the self-doubt, which enables them to back their creativity. The Beatles were just a bunch of young lads with time on their hands who found the confidence to persuade themselves and then the world that they were musicians.