@samhitha08,
You were brought up orthodox, but you are not orthodox in your mind.
You admit your fears are unreasonable; you fear your parents, who only wants the (albeit old-fashioned) best for you; and you fear your husband whom you say is a nice guy.
You weren't forced into marriage; you made the decision to sacrifice love for the sake of your family's social position.
You say your husband loves you, yet you cry because of your self-pity.
Your mother understands now, and shares your anguish, but you are committed and can not do anything about it. Doing anything unorthodox now will bring your family more shame than if you just said "no" to the marriage.
You ask for advice? Well, here it is - and you are not going to like it one bit.
Make the best of a bad situation, and dump the boyfriend. He is the center of your unhappiness, and you are incapable of making a rational decision at this time. Your boyfriend nurtured an illicit romance with you, knowing you cannot leave your husband, who loves you. Will your boyfriend marry a two-timing divorcée? Has he no social consciousness? In this country, the stereotype is the husband that's two-timing his wife whom he'll never leave and promises his mistress undying love.
Get religion lady and be respectful to your family, if not yourself. Throw off the shackles of childhood fears, for you are educated and can fend for yourself. Stop pitying your husband and learn to respect him - you both have weaknesses that can be overcome with each others help - work it.