Are you saying you can become famous and write a hit song and buy a house or you are saying you actually have all that already? I am am an artist. I exhibit and compete locally and regionally. But I’d never sell my art for the price of the house or become famous (beyond local art scene). Not realistic.

If you think you are that good at song writing that you could become rich and famous then go for it. If it’s possible then there is no reason to be depressed about it.