Yes you can just use VG although adding some Distilled water wouldn't hurt in a tiny setup. If you aren't using any PG and just puffing on that tiny tank, well, unfortunately all I can say is, you do want to worry about temp with Max VG and trying to create huge clouds in a small setup, and too thick eliquid is a gunker in and of itself.
I do know a way to make your coil last INDEFINITELY and that would be to vape PURE air, just puff on that thing empty and don't hit the fire button. Your coil will last for LIFE, and you will be able to do all the imaginary but very cool vape tricks that you WISH.
I do think it's arguable that

URE VG in a tiny tank with no PG at all or anything to dilute it may actually SHORTEN the life of a coil, not extend it, even with flavors added and no nic.
I'm sort of hoping this is a passing phase for you, but if it's not and you want to use 100% vg, your coil will appreciate you for far longer if you actually get a tank made for more VG, make sure the airflow is pretty open and don't chain vape it, would be my advice. Sure, flavor shorten coil life as do other things and etc. . I would definitely use 10% (not more, you start to get poor vape production at that point) along with your no nic VG though.
Best of luck, I don't truly have an opinion on whether you should vape or not, that's up to you. I mean at your age (I'm guessing) I was doing FAR dumber stuff and far more often and etc. so who am I to judge, etc.
Welcome and all that
Anna