I agree with the posts saying you shouldn't drop out. You say you are failing but do you have any chance of graduating? I would definitely try to get a diploma, as everyone else said you'll have the feeling of being able to finish something at least. High school sucks ass, I know it does, but its worth it to just get through it --- I'm guessing everyone hates it. I'm a grad student now, and while some say they'd love to go back to highschool, one couldn't even begin to pay me enough.
The job market in the US has been real funky lately, my dad has no education and is a bread baker here in NY, and if the bakery he works at shuts down, he has no other skills, so he is shit out of luck. Having something to fall back on, even a highschool diploma is incredibly important.
Binge Artist, I don't think academia is a pure waste of time. At this point even having a BA is insanely common, and if this kid's welding stuff falls through...well, me almost having a MA would get me hired over him not even having a GED for almost any job other than labor, especially when low on the experience scale. Unfortunately that does matter, and to employers academia is not a waste of time...even in terms of welding, it does show them that you are capable of following through with things you start, which is important in ANY field, be it academia or welding or anything else.