I don't quite understand what "singing at a wedding or developing a singing career" means. If you are purely a personal hobby and your singing skills are not bad, I suggest that you don't need complicated professional training, just sing at the wedding. If you like this business very much, that is to say, you just want to sing as a career, then I suggest you go to a professional place for training. After all, you have to live on it. . . Given your introverted personality, this can be changed. I used to be an introverted person. As long as I pay attention to myself, I can make corrections, such as making more friends and learning to express myself (this is not a problem). And if you want to develop your singing career, your personality must change. For the future of singing, it is best to take part in the competition after professional training, or record the songs and send them to others. Just singing at the wedding is definitely not the best. . . Whether to host a one-stop wedding depends on your hobby, but one-stop service is not just a matter of singing. . . Whether you want to make a living by singing depends on your own hobbies. After all, it is normal for this road to hit a wall at the beginning. Only if you like it, you will persist, and until the end, you will be successful.