You have one life and youth is shorter still. Stop listening to people telling you to be realistic, stop conforming to their modest expectations, and chase what you actually want instead of what's safe.
Life is short, but youth is even shorter. And so use it while you got it. Unless you die, you can still get back up and try again. And so for me, it took me realizing that the people who were telling me what I need to do with my life had smaller goals than mine. Because if I told them what I really wanted, they'd be like, dude, get real. And so you might have that too. Some people in your life may be like, be realistic. It's like, I'm not trying to be realistic, man. I got one life. I'm going to die.