Hi, not sure how you were able to afford your phone, but with a little effort, you can start to build a nice little recording setup.
Get a second hand computer. They are selling computers (laptop) about 5+ years old for pennies on the dollar. You could probably pick a decent one up for $50 or less. Lot of people will give it to you just to get it out of their house. Get an audio interface, once again, these things have been out there long enough that one on Facebook or Goodwill, probably could pick one up $10-20. There has been little improvement to audio interfaces in the last 10+ years. So, chances are, if it is one of the main brands, it will get you what you need. Two channel is fine.
Learn. You sound young enough you have the energy to learn this. I have to say this, but recording on an iPhone will not get you the results you are looking for. It is not spontaneous like everyone thinks. You have to arrange, practice, there are very few natural singers, you have to learn how to do it.
If you really want to do it, you will give it the effort it deserves. I think you have a voice, but what you recorded isn't even close to how good it can be. Your voice should be heard, give it the attention it requires.
Let us know how we can help you build you recording area on the cheap. Lots of people here that can help you get there, but you still have to do it.