It's not "truth", it's your OPINION.
Other people have em too.
Well that's what it comes down to isn't it, we all want to make our own truth - we been doing it since the whole apple fiasco in the garden.
One simple statement
Jesus saith to him: I am the way, and the truth, and the life. No man cometh to the Father, but by me. Matthew 14:6
and we just can't listen. We have to keep doing it our way.
He gives us the great gift of a teacher
16 Simon Peter answered and said: Thou art Christ, the Son of the living God. 17 And Jesus answering, said to him: Blessed art thou, Simon Bar-Jona: because flesh and blood hath not revealed it to thee, but my Father who is in heaven. 18 And I say to thee: That thou art Peter; and upon this rock I will build my church, and the gates of hell shall not prevail against it. 19 And I will give to thee the keys of the kingdom of heaven. And whatsoever thou shalt bind upon earth, it shall be bound also in heaven: and whatsoever thou shalt loose upon earth, it shall be loosed also in heaven. Matthew 16:16-19
but like spoiled children we won't listen to him even when he speaks with the voice of Him that has all authority.
Therefore, by the authority which Christ conferred upon Peter and his Successors, and in communion with the Bishops of the Catholic Church, I confirm that the direct and voluntary killing of an innocent human being is always gravely immoral. This doctrine, based upon that unwritten law which man, in the light of reason, finds in his own heart (cf. Rom 2:14-15), is reaffirmed by Sacred Scripture, transmitted by the Tradition of the Church and taught by the ordinary and universal Magisterium. Evangelium Vitae, 57
John Paul II, 1995