Can you make yourself intentionally interested in a topic?
But being obsessively interested in one/few of them is a completely different matter -- a lot of other "normal" aspects of life tend to suffer as a side-effect. Our society does not do a good job of nurturing and encouraging such lopsided profiles, and trying to keep that spark alive while leading a "normal" life extracts an incredibly heavy cost. Understandably, most "normal" people (instinctively) find that to be a cost not worth paying. Embedded in contemporary society, few such people manage to pursue their interest to their satisfaction, and fewer do well enough to be considered "successful" by society (a vanishing fraction become outstandingly successful, and are then called "geniuses").