I would think that priests choose celibacy when they take Holy Orders. They don’t become priests and are then told, “By the way, you can never get married.” It’s a choice they make. As for abstaining from meat, giving up meat on wednesdays and fridays as an act of sacrifice is hardly abstaining from meat the way it is suggested in Timothy and being ungrateful for it. In fact, giving up something like meat (which was a luxury in the time lent started, we tend to take it for granted today) is showing gratitude because the point is that you’re supposed to be giving up something good that you enjoy. If meat was bad and you gave it up, it’s hardly a sacrifice, and if it’s evil and we shouldn’t be grateful for it, shouldn’t we be abstaining from it ALL the time? Or is it only evil on certain days of the year? Answer: It’s not evil at all and we should always show gratitude for everything God’s given us.
As for sacrifice, it is a deed to please the church, in keeping with the traditions of men. It is not pleasing to God, no more than vain repetitions of "Hail Mary":
And when you pray, do not use vain repetitions as the heathen do. For they think that they will be heard for their many words. Matthew 6:7
The bible and Catholicism contradict each other. I'll stick with the bible, thanks.