Why is it so hard for me to ask for money?

I am not sure if I told you this in the past. I made an pizza art piece some time ago. I intended to sell it to a local pizza place. But when I came there I was not comfortable/awkward asking for money. So I just gifted it away...

Also on facebook group a while ago I saw some person asking for a very big painting. And offering only up to 50 eur for it... I imagine that people want many services but a rarely willing to pay decent money for it. Also when people are paying big money it is distributed in weird way. Like farmers/ food manufacturers are getting very little money compared to shops.