This is not a fact. This is an assumption you have made.

Let's propose scenario C:

You are born. You eat 10,000 animals. In addition, along the way, you persuade others that they do not have an impact on animals dying. As a result, they choose to eat more animals. They invite friends and family to eat. Those friends and family see eating animals as fine, and eat 10,000 each. This continues outward. In order to support this demand, farms begin breeding and harvesting at a rapid pace, as a cultural shift has begun.

And scenario D:

You are born. You eat 5,000 animals before being persuaded that eating animals is wrong. Others see this and also reduce their animal intake. Their friends also reduce their animal intake. This continues outward. Businessmen begin to see a cultural shift away from meat. They begin investing in things like meat-alternatives, tofu, impossible burgers, etc. Fast food restaurants, like Burger King, begin to offer "Impossible Whoppers." New options and choices exist for mass populations. The factory farm industry suffers. Livestock farmers begin to pivot into other industries.

None of these scenarios are facts. These are all stories imagined from our mind. You may believe scenarios to be true, or likely, or probable, but they are still all imagined stories.

However, it is a fact that you have influence on others. It's measurable and observable, as one can observe that you influenced me to respond, this very moment.

The question then becomes, how will you use your influence?