This is unfortunate. The words hail from the latin word, Amator, which means lover, devoted friend, or someone who is in avid pursuit of a objective.
The latter sounds a lot like a recipe for passion to me.
Perhaps one reason we don't have enough passionate artists, creators and seekers in the world today is because too many people hold in their heads the pejorative definition of amateur.
Being an amateur isn't a bad thing. It's a good thing.
Go ahead, embrace your passion and your amateurism — it is endless source of inspiration and energy.