Azure,
I can sympathize with you, the crush on an older boy can be so exhilarating yet painful at the same time.
Just keep your head in the clouds, but your feet on the ground - meaning it is okay to daydream about him, but remember he is 4 years older and that is a lot of time at your age.
I also had a crush on an older boy - mine was 5 years difference. I am thankful that we were neighborhood friends, hung out and had a lot of fun, but nothing romantic. When I turned 19, we confessed our crushes and ended up dating for a while and I know I could still call him up 20 years later and he would be there for me.
That is so much more important in life - pursuing him at 14 would have been a mistake, and I would have been hurt when he dated girls his own age. But to crush on him from afar was an experience I wouldn't change
Be nice, be funny, be a friend...just don't expect 'romance' - at least not for a few years.
Good luck!