That is your personal opinion, one you are perfectly entitled to. This doesn't however make it true for the rest of us. Using your argument one could argue that the the fetus is not an independent being until it is able to live without the mother basically acting as a life support machine.
Your conflating your opinion of when something becomes human with what is morally right. Again, most abortion laws are influenced by scientific research. The public are often informed by this research.
Why does your opinion of when human life begins trump mine or anybody else's?