it's still better than not graduating at all or even earning a GED. age is only a number. just continue what you have been to graduate, then worry about the next steps then.
though, it's never too early to start planning now too. do you want to go to college? plenty of people don't go when they're 17 or 18. plenty of people work before college to save money. some don't go to college at all and just enter the work force. talk with your family, and a counselor or adviser at high school. they can help plan, guide, and prepare you for life after high school. whether it's college, maybe community college, trade school, military (they have plenty of "civilian" jobs besides infantry), or just start working entry level jobs like inside sales, maybe logistics, customer service, administrative assistant, business development, or other similar office jobs.
see if you can even get internships while in high school too. that will go a long way to getting a good job with the experience you can put on your resume than just a random part time job to earn fast cash. again, talk to a counselor or adviser for help.