That's incorrect. Gold became valuable in historic times because of its awesome properties as a metal: Doesn't rust, easy malleable, beautiful without much processing(i.e. compared to rough steel), high conductivity of electricity and heat... etc..

At some point, on some societies, things like rare sea shells, or big stones, were used as currency, but they didn't survive times for a good reason: No real use in real life.

Same with bitcoin, unless it starts having real use in real life, it wont survive. People buy it because they expect it will go up. It is like the Kim Kardashian of currencies, popular just because it is popular. But once that expectation is broken (i.e. of bitcoin always rising in value), than the downspiral starts.