@Readyornot,
A major mistake should be put right sooner, not later. Your marriage was a mistake. A big one. Your husband's family clearly feel you are not right for him. They are right. I pity him more than you. You are vain and selfish. Vain - you say you have "beauty inside and out". Selfish - you went to "second base" (whatever that is) with a woman only 2 weeks after you got married!
Your thinking is muddled and/or dishonest: you wrote "I
have always been faithful throughout my 5 yr relationship." and straight away mentioned canoodling with a woman!
Your marriage will never be happy. What you should do is:
1. Tell your husband that you made a mistake in marrying him, that you only love him as a friend, that you are at least bisexual and may be a lesbian, that you fooled around with a woman 2 weeks into your marriage, that you are moving out and that you will be seeking a divorce.
2. Move out and see a lawyer.
If you do not have the courage to do these things now, my guess is that as time passes you will be forced to do them anyway.