I'm not doubting that the church is right, I just can not honestly and truthfully say that I agree with the church's teachings on this subject, and I would like someone to explain to me why I'm wrong with resorting to an appeal to authority.
I believe you are sincere, but the Church is authoritarian. We are not permitted to "agree" with doctrine or dogma. You may be having a crisis of Faith because you don't understand Her teachings. Take the time to learn. There are many many traditional Catholic resources, even here on this forum.
oh, and yes, children are selfish, that's why parents teach and guide them, or they would only do what serves them, not what is in their best interest.
And it is God who gives the authority to parents to parent, via the example of Jesus himself, in submission to Mary and Joseph. That's an easy one.
Lastly, what is "natural" is natural law. Look it up. Study it well.
These are good examples that you don't have an understanding of Catholic teaching. Please, I implore you, learn the Faith.
Be assured of our prayers.