There was a time this honor was reserved for the "elite". Not anymore. You've seen our recent elected officials.. cmon. And who cares if you win or not?
Entrance fee is minimal. All you need is a youtube channel and a website. There's nothing stopping you. You only live once!
Need money..."Go fund me"? Talk to your relatives too
https://www.usa.gov/requirements-for-presidential-candidates
If you feel bad about the probability of losing, just realize... Donald Trump LOST! Jimmy Carter... LOST!! Pretty much everyone that ever ran LOST! You are in good company.
What would your greatest achievements be, should you achieve your goal?
* Mine would be lowering the cost of the government, you'll have never seen such penny pinching.