It’s pretty normal to have some narcissistic inclinations as a 19 year old, but it’s important to recognize that it’s fundamentally from a place of insecurity and excessive worry about how others perceive you. A good therapist could be helpful.

Try this. Not a therapist but some self reflection.

I'm above average in height. I'm stronger than most. I'm very bright. I hold strong opinions. I speak about them in the real world very rarely because nobody cares about "you" and they care about what you offer.

You don't care about your gym owner, his financial pain, his lack of business sense. You just want what you can get as cheap as possible. That's the market. That's life.

Ask yourself: what do I bring to this relationship, this encounter, this moment?

What should you do? Think about the 91 year old self. What are you going to do for him? He'll eventually resent you if you don't make decisions for him. He won't care if you failed. He'll care only if you made choices for the you now or the you later.