I know the whole feeling of 'I'm young and therefore no-one takes me seriously' as well as the 'I'm different/better than everyone else'
I used to think the same way when I was about your age.
But, as it turns out I grew up and realised that I was no better and no different to anyone else out there. My ideas were no better (or worse) than any others out there.
Honestly, I understand the 'why does no-one take me seriously' thing. I do. But, there's a reason the master Directors, the master DPs, the master filmmakers aren't 20. Filmmaking really is one of those arts where you need to put in your 10,000 practice hours. The master DPs aren't in their 50s and 60s because no-one gave them a break until they were older. They're older because it takes a long time to reach mastery in your craft. It doesn't happen overnight, and it doesn't happen while you're distracted by high school, no matter how good you think you are, and how much better at a certain thing you think you are, and potentially are, than those around you.
Assuming you really are passionate about film, this won't be the last film you make, and it probably won't be the best film you make. So get out there and make it. Shoot it on an iPhone, shoot it on a DSLR, shoot it on a handycam. Just shoot it. And then focus on the next one. And then the next one. And you'll gradually get better and better and you'll eventually start making really good films, and possibly getting paid, or at least being able to get RED cameras or the like.
A lot of people get caught up in their current film, and how it's going to be a 'masterpiece' and 'the next best thing', their 'big break' etc. and you want everything to be perfect. Yes, you need to do your pre-pro, yes you need to do as best you can. But, don't hang out because you simply cannot shoot it on anything other than a camera that shoots raw, because that's simply untrue.
I shot over the weekend on a 5DmkIII. Now, it's been a while since I've shot on a DSLR, and in my initial discussions with the Director I said that the film would really suit and look great on S16mm. He agreed, but said he didn't have the budget for it. So we compromised and shot on a mkIII. Does that mean the films any worse? Of course not. Yes, it would have looked really nice on S16, but it still looks good on a 5D. We could've spent the next year in limbo trying to raise funds to shoot on S16, or find a RED, or wait for a Blackmagic camera to arrive. But we didn't. We shot it and we got it done, and it looks great.
Work with what you have, don't put things off in the hope that you might get something better. If the story's good enough and the movie is wathcable, it really doesn't matter what you shot it on. The audience certainly doesn't care.