If I was under 18 and trying to cash out that kind of money, my guardians at the time would have been the first people I would be turning to to help me figure out how to tread what could be tricky waters.  I obviously have no idea what your personal situation is, but hopefully you have someone you can turn to?  I'm sure the laws are different in Canada, but in the US, I was still on my paren'ts taxes until I was 18, which impacted both how they, and I, could file.

If you're not going to be putting that money in banks, as you stated, are you planning on turning it into goods soon?  If not, having that kind of cash sitting around isn't something I personally would be comfortable with at all.

Best of luck to you.  Also, major kudos on creating that kind of wealth for yourself at you age.