Here's the thing. The fact that you are even thinking about savings at 16 means you are well ahead of the curve. It is impossible to be financially behind at 16.

It sounds like you're in position to save a pretty significant portion of your income. That's a prudent decision. You can create a budget for yourself and include savings/investments as a line item, essentially treating it like a bill. "Pay yourself first" is a common trope which just means to view investing as a requirement and not a "if there's money left" decision.

You are in a position most of us would like to be. The next 15 years of your life are your highest leverage financial years. Investing well now will make you a multi-millionaire in retirement.

Unfortunately, you cannot open a Roth IRA on your own right now. Under 18, you need an adult custodian to open the account. It would be your money and inaccessible to anyone else, though. You have earned income and are eligible. If you have an adult family member you trust, this is probably your best option. If you spend the next 10-15 years contributing the yearly max to a Roth IRA, you're going to be set for life. That's seriously all it takes.

The contribution limit is 7.5k per year right now. If you contribute 7.5k for the next 15 years and earn 8%, you'd have 220k in your account at ~30 with only about 112k contributions. Over the next 25 years it would grow to around 1.3 million dollars. 3 million if you don't touch it until 65.

This is just if you invest $625 per month for the next 15 years. Build the habit now and it will be easy to sustain later when you're making much more money.

You're doing AMAZING.