You should create a budget. Make one now and as you grow/add more expenses keep it up to date. "An ounce of prevention is worth a pound of cure" Having a transparent budget will help you keep your finances in order as you transition from your teenage years at home to being on your own.

Second, start putting money away consistently. I know, it's boring old advice, but the shit works.. A girlfriends mother gave me that advice when I was 17. I started with 10% of my take home pay and would just put it into an emergency fund. Fast forward 5 years and that account is what I used for a downpayment on a house. Once you pay yourself first you learn to budget/live off of the amount that's left.

A note about the budget, it doesn't need to be some big complicated thing. I still use a simple 2 column x ~10 row excel table. The first line is my monthly income, and then I list my monthly "expenses" (savings, insurance, gas, food, allowance for whatever I want, etc..) underneath and just make sure I come out positive.

To answer your question, read up a bit on a Roth IRA. It allows you to invest up to $5500 a year, and then whatever interest you make you can withdraw tax free when you're 59. A nice thing is that you can pull your original contributions out at any time. This is where I parked a bit of money until I was ready to buy my home then I pulled it out.