Looking at your birth chart I can say that your chart clearly shows emotional confusion and delay in marriage due to strong karmic lessons connected with relationships. In your birth chart 5th house which is the house of love relationships, is ruled by Jupiter and placed with debilitated Saturn, leading to confusion and inability to choose what you want related to your love life. Venus, incidentally, is debilitated as well in the 11th house. Venus and Moon show emotionally attached but mentally unsettled due to the aspect of Ketu, which is why your heart and mind are not in agreement. Since it is an interfaith relationship, fear of family and society is naturally creating pressure. Presently, you are in the Jupiter-Saturn period, and you should not rush into marriage till end of next year. The period after October next year appears more supportive for clarity and final decision-making. With Venus and Moon together, the possibility of a love marriage is there, but family involvement may eventually become important as well.
You also have to understand that families often put pressure on children not to marry outside religion or caste because they fear that marriage may eventually create emotional distance from the family. In most cases, this fear comes from love and attachment that they have for their child. However, as you mature in life, making independent decisions also becomes part of personal growth and understanding yourself better. You should calmly convince your parents that your decision for marriage is not about distancing yourself from the family, because your love and respect for them remains equally strong. Rather, it is part of eventually finding yourself, your happiness, and your emotional peace in life.