While some factors are genetic, Rutkowski says that growing up in a musical environment strongly influences whether someone sings well and confidently. 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.
If you want to learn how to sing online, Reddit is another option. There's all kinds of “Teach yourself how to sing Reddit threads to choose from. Almost anyone can learn to sing basic tuned songs, but actually singing, at the highest level your potential allows, is going to take a lot of hard work. Instead, it starts from the basics and takes you step by step to learn to control your voice and sing with precision and reliability.
The natural timbre of your voice is determined by genetics, but you can learn to train and develop your voice. Like everything else worth doing, learning to sing can be demanding and rewarding at the same time. Movie stars learn to sing all the time for a role (usually surrounded by a team of vocal teachers and months of daily practice). By investing time in learning to read music and understand musical concepts, you'll learn to sing better and faster.
That's because learning to sing in tune requires you to get feedback on whether you're in the note or not. SingTrue leads you to learn to control your vocal tone and to feel comfortable and confident with the fundamentals of singing. In fact, when we talked to people who wanted to be good singers but were intimidated by the idea of learning to sing, we learned that there are actually 5 main barriers to becoming a singer, and singing in tune is just one of them. I think taking classes is the most important thing you can do for yourself because it teaches you to have a work ethic, which is very important in this business, and to be aware of learning new songs, learning old songs and simply perfecting your craft.
In my professional opinion, as long as you don't have any medical problems affecting your voice, you can learn to sing period. The voice is considered an instrument, and most people have the ability to learn an instrument, so the same goes for the voice. Realistically, anyone willing to put some time and effort into learning how to sing better will reap the rewards of seeing their skills grow and their music-making skills improve, often by leaps and bounds.