I make about $500 cash a week doing some under the table gigs. I do not sell drugs or anything sketchy like that but I do cash business stuff. I'm 16 so I have a teen checking account and have been making cash deposits every few weeks of usually around $1000. The bank tellers always question where I work or how I get the money and it makes me nervous cause technically the money is untaxed. Is there any real chance they could flag my banking activities to the authorities or are they just being nosy and my money is too insignificant to get any attention?

You could have troubles but I sold drugs such as marijuana and cocaine and I still have not paid a single cent of tax... Never got questioned by the authorities to pay the tax so it's okay.

You are in trouble. Your bank has probably submitted a SAR on you

Find a good lawyer

Better to declare the income on a tax return.

At the very least keep records of who paid you, how much and when.

If they see you making cash deposits on a regular basis they may become suspicious.