It all depends on what your future plans are and hopefully, you are thinking about them right now because this uis a very important time for you. Film School can give you lots of things such as access to the latest equipment and lots of knowledge on how to do things correctnly such as lighting and composition and things like that. When I attended a school for production, I found out that I short so many things incorrectly when I was in high school, so film school is definitely a plus in this area.
There can be both technical and professional resources that you can gain from film school, which may help you further your carrer once graduating from film school. Still, many famous filmmakers and directors (that includes directors from all over the world) did not attend film school and they are doing just fine. Again, it all depends on what you want and what your goals are for say, 4 years from now. Do you want a hollywood job? Do you want to work in Television OR Do you want to be a freelancer OR Do you want to be an independent filmmaker OR do you want to be a film hobbyist?
Your goals will determine you decision for going to film school or not. Keep in mind that film school is not cheap and unless you get a scholarship (I recommend that you try to apply for some if you are going the film school route, because you could be one of those very talented who gets full or partial tuition covered...you never know until you try!), it is going to cost much more money than making films on your own or with colleagues (if you stick with low budgets) and learning that way.
Read some cool filmmaking books that interest you, make one of those old school Pros s. Cons list and then just do what is right for you. No one can really tell you what to do when it comes to this particular decision. School has really helped me to learn a lot, but I know of one classmate who didn't always come to class much. You would think that he would be one of those film school drop-outs or one of those people who got bad grades, but he actually did his work, only to add to his reel while he spent most of his off-time (and some clas time) working on real productions around town.....and now he has major film and television credits and may even be able to get into one of the Unions. He got where he is now because of his hard work and while school may have helped him along the way, most of the reason he is able to get good film and tv crew jobs is because he was out there working on set from day one.
You will make the choice that is right for you.
