I don't want to go into the background details, so I'll just give it to you as it is.

I'm a 15 year old male(16 in November), who is in love with a 20 year old female(21 in October).
We both have mutual feelings for each other, and have gone on 'dates' together.

Recently we sat down and talked about us and our feelings. She says she loves me and would want to be my girlfriend.
I love her too. She has changed my life for the better in the year we've known each other, but that's another story.
I really want to be with her too.
I hate to drop this cliche but, she completes me, there is no other way to say it.

But, should I? Should I listen to my heart(sorry, another cliche)and be with her? Or is the age difference too much?