And you are not alone. It appears that most of us receiving childhood vacinations were getting shots derived from fetal tissue. Here's a good overview of the history and why:
Human Cell Strains in Vaccine Development | History of Vaccines. What is important to note is that the drug companies have been using the same lines of regerated cells for decades and are not using new fetal tissue.
Also, the morality of using cells derived from fetal tissue has been bandied about quite a bit. It wasn't something that I thought much about, but apparently the Catholic Church has. They don't see it as immoral to use such vaccines though they recommend using vaccines not derived from fetal lines where possible (
https://mycatholicdoctor.com/wp-content/uploads/2018/12/vaticanresponse1.pdf). It is actually a good read. My summation does not do it justice.
As for the Regeneron itself, in a quote from the company (
Trump’s antibody treatment was tested using cells originally derived from an abortion), testing was done on a line of fetal cells that originated in the 1970s but no fetal cels were used in the vaccine itself. They did not go out and buy an aborted baby from Planned Parenthood. They used cells that had been dividing themselves for years.
As this is a Christian forum, though, the story that comes to mind for me is that of Joseph and being sold into slavery. "But as for you, ye thought evil against me;
but G-d meant it unto good, to bring to pass, as
it is this day, to save much people alive." (Gen 50:20 KJV). Being sold into slavery was, without a doubt, evil, but G-d used that to save thousands upon thousands of lives. The abortion of the babies that started the cell lines used in vaccines was without a doubt evil, but the vaccines that have been developed from them have been used to save millions if not hundreds of millions of lives. It is a prime example of G-d using something evil for good.
It is also a good example of researching something before you decide. Just because a headline sounds lurid may not mean that is actually what is presented. The world is not exclusively black and white.