I've learned over time to just call my obsessions "hobbies" and "interests." I've learned over the years to sorta multitask my obsessions, either out of me wanting multiple obsessions, or people telling me my interests were too narrow. In time, I sorta became a bit of a "renaissance man" of sorts, with lots of knowledge about lots of things.
But, with the "more like waves" comment, I have to agree, I don't usually "lose" obsessions, just things go back and forth, and all work together sorta.
IE, I used to be really quite "obsessed" with anime, and while I still like anime, watch it, etc, it's less "obsession" than it used to be, but now, I've gotten "obsessed" with Japanese music, stemming from the anime, so anime the anime helped that one, etc.
I think for MOST things in my life, I've been able to pass off some stuff as hobbies or whatever. The key for an obsession, and success in it, is finding the right venue for it. IE, Darius McCollum, man with Aspergers and an obsession with trains, has gotten like 15 convictions for stealing trains. What happened was quite tragic, as a kid, someone in his class stabbed him and he almost died, so he'd just skip school after that and ride the subway, eventually the conductors became friends with him, showed him how to operate the trains, and supposedly they'd have him cover their shifts even. He'd "work" for free, on the trains, as a kid, just because he loved trains so much. Eventually, he "stole" a train, and got arrested. So, if things worked out slightly nicer for him, he could potentially have had a wonderful career in his passion, but partially due to the actions of others, purposely or inadvertantly (ie, teaching him how to operate a train at age 12), and obviously due to his own (pretending to be an employee of NY Transit) he's spent half his life in prison. For him, things just didn't work out for his "obsession" and him, for him to make anything useful of it, society wouldn't allow it to be so.
But really, don't worry about your "obsessions." NTs have narrower stupider interests in more ridiculous things (American Idol...) more likely, your's are just different, and it helps make the world go 'round. Or something.