Life begins at conception, this is not a religious debate, but a biological fact. If you choose to have an abortion you are killing a developing human. Few care about killing a chicken, few care about chopping down a tree, so your comparisons are half baked at best. Every human was once a fetus, including you. Why are you okay with another person having complete say on whether you live or die? You call it pro-choice, but it takes away the choice from the one being effected by this decision the most, the baby.
If you have no qualms about taking a life in the womb then you should have no qualms about taking a life outside the womb. And if that is the case, you are a very troubled individual.