I think this is between you and your parents. Why you should hate your husband? Contrarily you have done injustice to him. Any male would expect sexual relation with wife! You have not mentioned under what circumstances he slapped you. Just because you could not displease your parents, you made compromise and now you hate him!!
You have only two options; accept your current marriage or go against your parent’s wish. If you are having suicidal thoughts then you should consult Psychiatrist on urgent basis.