I love her so never want to let her go...?

i don't know what is about her i have been with other girls but she is the right girl i just feel a little young but we are so close its not even funny it feels like i will be with her for a very long time she is so loyal to me and always cares for me as i do i just don't know what to do when i graduate i am afraid that i might not be able to keep her because she will be to busy with school likewise for me except i will be in college and she will still be in school i just don't want to mess this up we love each other i am a senior she is a junior any ways to keep her close even though i am gonna go away to college?