Sow.Priyanka,
If your statements are reviewed, it’s clear that being an Iyengar girl (if brought up in a typical Iyengar culture) you have preferred a BC boy outside your clan. This shows, subconsciously, you are prepared to break the tradition. Ok. If it’s not merely infatuation or gender attraction, and you have good reasons to justify to select the boy, please go ahead. However, your option to take opinions from third party and the boy’s decision that he will marry only if your parents agree (an excellent gesture from him) reveals that some corner both of you are NOT serious about the relation. If so, better quit it. Earlier the better.
Now the problems you both have to face are because of total variation in foods, habits, language (slangs), and inter family relations and rituals.
Of all problems, the food is the sole and main problem. Being a Brahmin if you can prepare non-beg or eat non-veg or sit next to non-veg eating relatives and have no issues of non-veg, excellent. 90% of problems between you two are solved. If not, it’s going to be hell for you, after the shine of love post marriage start vanishing. Next comes, inter and intramural family relations. Some one or the other in either community may prick you on a wrong side and may even defame or give pungent remarks on Brahmins and their age old culture. Yes, you have to digest or swallow it. Else, will become an issue. Also,your parents (if they are strict followers of brahminism) voluntarily never like to share the same dining table or kitchen or Fridge having non-veg and problem comes when they refuse to eat or share food items and start saying today is such and such a day and please avoid xyz.
So, you may have unwilling visits of parents and they may keep silence, not because they agreed your actions but for your family harmony.
Next issue is your children and their food habits. You cannot insist on vegetarian food nor anyone including your BC husband will like to hear you or your parents saying his mother was a Brahmin. Please note: Once you marry outside Brahmin culture - I will not say Caste, you loose your own identity as a Brahmin from the day one of marriage. You are neither a Brahmin or BC to the core of your own self consciousness and for the society. You have to be prepared for such un expressible inner emotional turmoils. This may lead to depression or frustration or self deceptive attitudes, which are not good for one’s life.
Finally, I would like to say & conclude more as an elderly (Sr.Citizen), socially aware & self-experienced, Iyengar Individual than as a highly placed scientist (technocrat and professional), widely travelled throughout India and foreign countries (but very strictly following Iyengar traditions & Culture besides being absolutely true vegetarian, no smoking, no drinks, etc): It’s your life, your preference, your freedom of living, etc. But, remember, Veda says, Brahmin, like Hinduism, is not a caste but a highly refined Culture. It takes centuries and multiple births to acquire a real Brahmin culture. On the contrary, If you, as an Iyengar girl marry a BC or any other less fortunate boy/family to learn Veda and inculcate the best points, rituals and traditions of brahminism to that family than that’s a great achievement and your so called inter-caste marriage becomes a boon of your life.
Please remember, nothing is correct, nothing is wrong, and it all depends on how one visualise one’s own action and reaction. Think twice and whatever you have taken you are only responsible and you should not regret later in life. Please note, hardly few Vedic sages were Brahmin and many became sages “Brahmin” by their deeds and enlightenment. May lord Narayana bless you both for a meaningful divine life ahead, as partners or as individuals. God bless all. V.Rajagopalan.