Honest question about bitcoin

If bitcoin was originally intended to be a decentralized digital currency, why are people treating it like an investment? Isn’t the point of currency to be used as an instrument for money or a medium to exchange goods/services?

Just to spitball an example, if a small government printed money for its population and the majority decided to hold on to their money instead of using it as it was intended, consequently the government would have to print more money so the population can function and this would lead to the value of the printed money going down.

I think bitcoin is going down because people are not utilizing it the way it was intended and it’s driving the demand for its use down. Welcome to hear your perspective on this.