Well I don't see to much wrong with it. As long as your not 18 which you say that your not. Then there is no legal problem. There really is only a couple years difference. However there may be a problem with maturity level since you are older than she is. She might not be able to handle a more mature relationship, that's not as juvenile. She might not even be aloud to date and specialy someone older. I would possibly ask her if her parents are ok with it, because if their not that might be a bad way to start a relationship with someone if not everyone is supportive. There may even be teasing on your side for dating someone younger. But don't fear because like all cheesy romance books and movies say " true love triumphs all" or something like that. LOL. Just go for it!