"What does it matter? I'm here now! And it only matters to me."

But it does matter - are you able to look back and imagine whether it matters at an earlier point in your life?
Did it matter to you when you were 6 years old? 6 months old? 6 days old?
Yes, no and no - perhaps.

But this is to miss the point completely. Did you become a person only when it began to matter?
Say when you realized people die? Or became hurt and you wanted to feel safe? When you went to school and met a bully?
Or when you were punished with times out?

Mostly in the United States we take our personhood for granted.  We live unaware for years without it mattering.
If you do not believe in God or our Declaration of Independence it might not matter at all. That would mean you are denying your birthright.

The declaration of independence points out that "...all men are created equal, that they are endowed by their Creator with certain unalienable rights, that among these are life, liberty and the pursuit of happiness." That is, we have an unalienable right to life. No one has a right superior to this right and the other two.
Not Planned Parenthood or the Supreme Court. It matters when you become a person.

It is obvious by now that it doesn't just happen when you become aware of the importance of your life. It matters before you were aware of the importance of your life. You matter. Your children matter. And if you are a pregnant woman it matters or there would NOT be abortions. An abortion is a sign of a misdirection of the importance of mattering - an indication of selfishness. (Even in cases of dangers to the mother there are two persons under medical care, not one.)

Life begins when one's sperm meets one's ovum. Life matters all the way back to that moment. Your life mattered when that happened.
Once that event occurs there is a relentless chain of events leading to you!  Not to an alligator, a bear  or a gorilla, but you!
Maybe this meeting of sperm and ovum is not convenient to the bearer of that relentless chain of events. However unfortunate that may seem to be, the creature in the worlds safest place has the unalienable right to life. The bearer is no longer in charge and must yield to the process.

If it is inconvenient the loving alternative is adoption. There is no stranger thing than to hear a woman say I would rather my child die than give it up for adoption! Many people think it ethical to terminate a pregnancy to avoid inconvenience or to avoid a baby being born into poverty. Adoption is the loving option.