Plenty of people (including me) are vegan, healthy, and happy. As omnivores above the poverty line, we can all make conscious and conscientious choices about what we eat. Going vegan is one of the most effective ways to combat global warming (if you're not in a position to donate large sums of money toward climate change research or mitigation).
Give it a couple decades. Most 'vegans' stop being vegan well before that. I'll let you Google why they do.
Vegans have never and will never appreciably reduced global emissions.
Global meat production is only increasing.
You're delusional with main character syndrome?
This is bullshit. The vast majority of CO2 is created by energy production.
The problem is systemic and blaming other people for their lifestyle choices is neither effective nor helpful and just leads to further division. It's exactly this sort of division that helps fossil companies to destroy the planet and keep making money.
Take a look to a soybean plantation for example, biodiversity totally destroyed. Also, are you doing a physical main work?
But someone still has to eat up all those cows before their methane mucks up the environment.
And if you're not willing to do your part, that just means the rest of us have to pull double duty.
I would say it’s important to emphasize people don’t need to go complete vegan. Reducing consumption of animal products can be more realistic for most people.