I receive emails all the time from people going through a tough time stuck in the crossroads between high school and college. While I can't really offer you any advice for your specific situation I can tell you what I've learned from my many mistakes along the way. I quit high school at 16 and took a pretty big risk in moving out of my parents house to what seemed like the big city at the time, Portland OR. I felt like I had a passion for something for the first time and could not spend another day following other people's perception of what my life should be. I worked countless bad jobs to support my love of BMX riding while I was younger and was able to always stay pretty happy because I always had riding to turn to regardless of my income.
I had always been interested in art when I was younger and eventually started a t-shirt company with friends called Salvation. This is where I learned for the first time the importance of combining multiple things you are passionate about to find your unique value. For me, it was art/fashion and bikes. I worked every day on this project and learned whatever I needed to in order to make it work from learning illustrator to building websites and none of it ever felt like work.
Through that journey, I gained the insight to start a shoe company called Lotek which eventually taught me what I needed to know to start a bike shop called Goods BMX which in a similar manner helped me learn what I needed to start Stranger. The craziest part when looking back is that none of this still felt like work at any point yet I was literally working in my own retail store, designing shoes, designing bikes, making graphics, editing videos, filming videos etc.
I ended up getting sponsored for riding my bike when I was in my 20's and learned a lot from the companies I rode for until eventually becoming the art director for MOSH bikes. I went to college three times along the way but did not learn a thing from it other than how to accumulate debt. The problem with the old concept that college = job is that on average most people work 14 different careers in their lives. With most schooling being focused on learning one skill (or no skill) it's difficult to prepare for the modern world. The jobs I thought were relevant when I went to college are not very relevant anymore and the job I do now did not exist back then. In a similar nature, it's likely the jobs you will hold in 10 years do not exist now.
So with that winding history lesson coming to an end the single most important thing I learned was how to have a consistent drive. No matter what you find interest in if you show up every day and make even one percent progress you will eventually be successful whether it's bike tricks, making videos, designing websites, or any number of other things. This drive and work ethic that you develop will be there for you no matter what direction your passions take you. The only advice I can offer from my journey is to let your passion choose you. You will know when you've found it because things will feel like they are falling into place effortlessly and everything will flow. When you immerse yourself in something you love work won't feel like work. Second to that (or maybe first) is develop your creative thinking process. Your creative thinking can be grown with daily exercise just like a muscle. Start an idea journal and write down 10 new ideas every morning when your brain is at it's prime and you will be surprised by the changes it will bring to your life I promise (Thank you James Altucher). A strong work ethic paired with creativity will take you places you can't imagine.