Then you are morally confused. If all moral decisions are relative, then there can be no moral difference between cruelty and non-cruelty, between torturing babies and feeding the poor - all becomes mere personal preference. There is a huge difference between what I like or prefer and what I think is morally right. If I say abortion is wrong, I am not merely saying that I don't prefer it, I am saying it is wrong whether I prefer it or not. Your morals make no distinction between preference and right and wrong. Moral principles are not decided by men, they are discovered, and exist independent of man's beief.
I will tell you now that you will not be able to logically defend your belief. Moral relativism is a lie and it is indefensible logically.