Upbeat sweet country song, about looking forward to the future, but knowing that the people you're attached to will miss you so much.
Other songs like this one:
I'm Not Gonna Cry - Corey Smith
Pop ballad about graduation day, and embracing the future, while knowing that the best days and best friends will be missed.
You're Gonna Miss This - Trace Adkins
This mid-tempo country song is about the various stages of life, and to make the most of now: "You're gonna wish these days/Hadn't gone by so fast These are some good times/So take a good look around You may not know it now/But you're gonna miss this".