love marriage

No, Though, Muslim Law permits marriage at the age of puberty. But, that marriage occured with the consent of parents when both girl and boy are muslim. Here, yours is love marriage, if your girl friends parents are against your marriage then they can take all legal action against you as well as that marriage will not be called as valid in the eye of law. As well as you are minor and for valid marriage both parties need to be major.   

In your case your age is required to be 21 years and above. So, you will have to wait for a year.