It’s a question you’ll need to answer for yourself. I’d say that it’s living a life that you feel is meaningful. So you’ll need to figure out who you are, what you want to be, what matters to you, what you like to do, etc. You’ll have experiences in school and in life that will inform those questions, but it’ll be up to you to be alert to them and honest with yourself. School can help you with the skills and network and can certainly make more opportunities available to you. While you’re thinking through this, it’s good to keep your options open, so that’s probably part of what your teachers are telling you.