You can learn how to sing a song if you know how the enumeration of pronunciation works.

Pronunciation has weight and form, and there is a reason for the sequence of pronunciations, the alignment that happens, and the form of the enumeration. For example, try pronouncing 'ah'. Then try pronouncing 'iy'. Try to see what you are doing when you change the pronunciation from ah to iy. It sounds difficult, but it's just to check. I don't think we often check the pronunciation and articulation of small sequences of sounds. For instance, when you have a cold, does your voice ever get rattly? The pitch and production of the sound changes and it feels kind of weird. If you remember that there are times when these changes are easy to notice, you will understand that there are small differences in pronunciation in everyday life. 

Your singing will always change. It is thought that only those who have always sung somewhat well can get better. However, with my practice method, you will always be able to conduct your singing beautifully. This is because it is more than a song, it is a series of sounds. If you want to be a good singer, you should think and feel how you are pronouncing the words. There is no magic spell that can suddenly make you a great singer. Rather, imagine your singing as a tower, built up from its foundations, and with each level that is added it soars further up into the sky.

 Now let's all think about singing. There are people who are said to be good singers who are somehow unstable. Why? It is because they sing without consideration for the importance of the arrangement of sounds, instead just making sense of such sequences in their own mind subconsciously. We would not say "Panja", we would say "Japan", and we do not consciously think about why the sounds are in such an order. That's fine if it comes naturally to you, but not knowing how to do it can actually be a source of instability. What about your singing, is there much that you can't explain? And if you're not very good at it, if you understand how you're doing it, you can always change it in a positive way. 

I encourage you to focus on the elementso you don't like, the small changes in pronunciation, the small differences. If you don't want to do something that isn't all fun, practising small differences will eventually become something you look forward to. It just takes a little time to get into the habit of it. I am sure that being able to focus on such things will open up your life in a brighter way. The first little bit can be a pain, but this is what you need, not only for singing, but for everything, isn't it?

Come on, you can all change today.
Let's sing a song, paying attention to the pronunciation!
If you are not sure, please comment and I will give you advice.