Do you have any savings? Do you plan to move out at any point in the future?
A motorcycle is another thing you DON'T need. Speaking from experience, when things go bad... It f****n hurts, it might not have been your fault, and it happens insanely fast. I still have nerve damage from an accident at 40 mph. Do yourself a favor and sell that ****.
Oh, I also had a really good friend who died on a motorcycle (on his way to propose to his girlfriend).
My dad almost died on a bike.
Sell it... Or don't...your call. Just my opinion.
Do you have the newest iPhone, Smartwatch, laptop, 70" 4k TV, PS4... These are things an 18yo with no bills should be buying