If you see a little child you can see the spark in their eyes. As we grow we keep loosing that spark. Life gets harder and keeps sucking the motivation out of us. I think motivation is the most precious thing in life and we loose it so easily without even being fully aware of it. As I grew up the most difficult thing I've faced is to keep myself motivated. The dreams we dream don't just come true. Our reality is totally different from our dreams.
Growing up we will face a lot of things. Maybe we see other people failing that's why we get discouraged and lose our motivation. But just keep on dreaming. Nothing is impossible in this world. If you are really willing to do it you can achieve it. Don't give up to your passion. If you are really passionate about your dream it can be an enough motivation to keep going on.