You mean to say you belong to an orthodox family where the family value is given more importance than individuals. It looks like you hardly had any choices during your upbringing and most of the time followed or accepted what your parents chose or thought better for you. I also notice that you are going through a lot of emotional blackmailing from your parents, do not worry you are not alone in this. It happens in most of the Indian households as we fail to draw clear boundaries in any relationship, that is because we are brought with stories saying that standing up for self or saying no to families is disrespect that we show towards them and you are no different, you have been following everything what your parents and for the first time you have gathered courage to say what you want and that has hurt them a lot. It is hard for them as well to take no from someone who has always said yes to them.
Now coming to what you can do, reflect back on your relationship with your boyfriend and analyze your parents perspective as well, is there any logic on what are they saying, does my relationship worth to stand by it? how would my future be if I go by what I want and how would it be if I go by what my parents want?
After you get an answer for all the above. Try and communicate with your parents and confront your feelings to them. and tell them how you are right if at all you think you are right at your place.
ALWAYS THINK BEFORE YOU ACT!!!!!