@akorfa
Good Morning! I am going to advocate for Speech and Language therapy. Have you ever been evaluated by a Speech and Language Pathologist for voice concerns? If you have a voice and still cannot sing, it might be related to your breathing; you might not be taking in enough air to suppport your voice. If you are not taking in enough air to support your voice to sing, it might be contributing to you feeling tired. It might worth looking into a voice specialist for an evaluation. Good luck!