Well, there will always be people that know "more" than you, as well as those who know "less" - that's just how it is.

The flip side is that it can be useful not to be too per-occupied with one direction.  Some pursuits are simply not worth pursuing (for most), others may lead to dead ends or perhaps synergies can be gained from focusing on multiple things.
You may love video games, for example, but becoming a pro gamer is probably beyond what most game enthusiasts could ever hope to achieve.  Of course, maybe if you do decide to head down the path, you may later discover that a slight change of course makes sense (perhaps streaming from Twitch), though this does require you to be a bit flexible.

But of course, you shouldn't be discouraged by others in your endeavours; ideally, however, you'd still take them into consideration (i.e. feasibility of your dream), provided (again ideally) you can make good judgements.
Working towards your passion can be a fickle thing - it can work, it may not.  Either case however, you'll probably learn a lot and being young (relative to your expected lifespan) gives you this opportunity.  So give it a try and see if it works!