How do I build an entrepreneur mindset? Help me break free.

Hello ya'll. Any advice would help! Please be patient.

Here is the story.

Back story long story short: I applied for a job. Got 1st and 2nd interview. Told them my nearest available date both times. Agreed salary + commision. Went at the shop to be oriented.

They said they were gonna send the contract before my official starting date. Followed up after finishing my obligations and they said that they no longer need new employees. I said I was already hired. I got BS excuse that I didnt have enough expertise (I am in sales for 2+ years but never on branded clothing) and then was left on read when I told them that training would be offered to everyone anyway + where was the heads up?

I am very determined to work and learned new skills. I know prior experience is always preferable but I am so highly disappointed of the lack of professionality. I was expecting a job as dealt with and they played pingpong for whose responsibility it was to deal with me.

Now, I really want to take off on my own. I would say that I am curious and always ready to learn new skills.

But I dont necessarily think that I am creative in solving solutions or making money which is a must-have if you are an entrepreneur.

How do I become creative and opportunistic?

How do I put things that I learn into action?
And how do I get the confidence that I know the things I do? Does it only come with time?

I am 22 btw. I live in a place where there is no Paypal so Fiverr or websites as such wont work for making few bucks.

Any suggestions?