There is nothing wrong with not feeling attracted to the opposite sex. (and I personally doubt
sexual attraction is a priority of God's,)
... but if this leads to a sexual relationship that is not in line with how God intended it to be, then it IS a sin, and it is harmful.
Notice: Harmful. To you.
Three very good friends of mine are bisexual. I love them no less than my other friends. I treat them no differently from my other friends. ... but I still know it is harmful to them , and that hurts, because they are wonderful people (none of them are Christian), and I wish for them to meet Christ , to have HIM as their first love, and be freed from their sin.
(I sin too , in other ways. I am no better than them, I just sin differently. ... but that doesn't mean I stop worrying about my friends).