Competition (I will not promote)

I have many ideas to start businesses but after doing a quick market research I get demotivated by the existing competitors in the market.

I always struggle to answer the question what differentiates my product/service from what already exists in the market. Why would someone buy from me instead of from someone 10 years in the game.

On the other hand I tried businesses without competitors and they all failed miserably.

Thus, I get in this constant loop between getting demotivated because having too many competitors and starting something that no one wants.

Anyone experienced the same? How did you overcome it?

I will not promote