IMHO you aren’t ready for college.
You may look down on the kids around you, have you considered how many 18-19 year old college students want to hang out with 16 year old kids? College is more than the classes you take, its learning from the kids around you and not necessarily the material on the syllabus. It’s a time of growth and experience, something you may miss out on to a great extent given your age and plans to live at home. Given the involvement with college you’ll end up with, especially living at home, to some extent college will be like taking online courses but attending the taping live.
If you consider learning the assigned material “grinding” what do you think college is going to be like when the pace and difficulty steps up? If you don’t find any satisfaction in your subjects now, what do you think changes when you get to college? Yes they offer subjects not taught in HS but in the end I think saying you aren’t finding any satisfaction in your current studies says more about you than the material, and I fear you will find more of the same in college.
Also your statements seem self-contradictory. If you find classes are “no academic challenge” then why the “grinding”? They ought to be so easy you have plenty of free time, and what time it takes to complete the assignments should not be a burden at all.