you sir, have a sad perspective of life and I'm sorry for you.
I'm not saying not to play to win, but to not say "it's just a game" is to recognize it as more then something that has little to no impact on your future.
Sure it's just a game... and money is just paper. Everything you own is just stuff. You are just a sack of water and assorted parts. Cool... are we done overly simplifying things to make them seem meaningless yet?
People apply different amounts of value to different things in life. What you might find worthwhile or "having an impact on your future" might not be the same things that other people value.
Playing this game will surely impact someone's future. They might play this game and then get interested in improving the game, and then go work for Riot, and then make a career out of it that can effect the rest of their life.
Maybe someone plays this game instead of going for a walk, and had they gone for a walk, they would have been hit by a drunk driver that veered off the road and killed them. That would have definitely impacted their future.
Maybe some guy plays this game and makes a friend... and then he finds out the friend is a girl and then they find out they like each other a lot, meet up, and end up getting married and having kids and living a great life together.
Maybe some guy plays this game and gets really good, goes on to compete in the LCS, becomes the best LoL player of all time and goes on to live a life of fame and fortune.
But yeah dude, it's just a game that has no impact on your future.
The only person with a sad perspective on life is you. Every little thing in your life can have an impact on your future. If you seriously think some hobbies or activities have ZERO value or impact on your life, then you are blatantly ignorant.