It is impossible to start a business without negativity. One of the benefits is that they allow each business to develop.
You just have to not listen to all the negative words said by people around you, focus on the business, and work diligently. If you believe in it, it will succeed well. As for the negatives such as loss, tiredness, and difficulties of some seasons in selling like summer, or end of the year, etc., It all depends on the business itself.
You can change some difficulties for your good by changing the product, developing it, providing a service to facilitate the use of the product, and so on.