I think it's possible to be good at anything without having any natural talent. You just need to work hard. Singing is partly innate and partly a learned skill. You can be born with vocal tracts that are physiologically sized and shaped to give your voice a more pleasant sound, which naturally lead the way to becoming a singer.
But controlling and configuring the vocal muscles to be able to sing well is a skill that you learn. Your voice is an instrument and if you don't use it often, use it correctly, take care of it and practice it, you won't get better at singing. As with any skill, the more you practice, the more competent you become. Athletes, painters and carpenters practice their chosen craft to become as skilled as possible.
If you want to become an accomplished singer, you need to practice every day. And while some are more successful than others when it comes to self-taught singing, you can't go wrong if you start with the right singing techniques. If you are a person who tries to sing well but always ends up missing the pitch, listening to someone without professional training do it effortlessly will play tricks with your mind. Anything you can do to make your whole body feel loose and comfortable when you're singing will shine through your performance.
So when you need to sing high notes in songs, it's a good idea to do a vocal exercise and then return to the song. Also, make sure you stand up straight, breathe through your diaphragm, and widen and relax your throat for a richer tone as you sing. So if you want to improve your respiratory support, increase vocal power and learn to sing in tune, learn good respiratory support. Immersing yourself in music will help train your ear to recognize different tones, which in turn will help to sing.
So if you can't afford private lessons right now, learning to sing online is one of the best ways to start. You should try to record yourself singing on your phone, this way you can give yourself the opportunity to get used to your voice and hear exactly what you sound like. When you start singing, being able to sing tones with precision without being too sharp or flat is a vocal control. Breathing exercises are essential to learning how to use the diaphragm, which is crucial for developing a powerful singing voice.
So, if you're having trouble with this, singing with a loud voice in your chest is a good place to start. The truth is that projecting your way of singing is one of the most important things to master when you are teaching yourself to sing. Finally, once you have a good sense of tone, good control, adequate vocal support, and the ability to control your dynamics, you need to develop a sense of style and sing properly.