Inter caste marriage

i have been in relationship with her for 2 years. Only problem is that she believes that we cant marry each other because of different caste. still atleast 4 years to go for the right age of marriage. she want to breakup now for the same reason and want to forget me so that she can marry as per her family requirements. In her family and relatives there is no one who have gone against there family decision. but i am not able to forget her or convince her. i am feeling very alone and low. NEED HELP.

convince her parents if they are still against then u have to accept it,friends,family,work studies hobbies will help you forget her,take counseilling also