Around a year ago, I started singing while listening to music in my ears; usually belting out lyrics while having my earbuds at full blast(not literally), but now when I try to sing A-cappella, my voice catches in my throat and I can't bring myself to sing anything.
This problem doesn't occur when I'm listening to the radio, singing along to music playing on my computer or singing with someone else, so I'm wondering if I've developed a mental block towards hearing myself? Does it have something to do with the fact that I sang for hours on end with earbuds in?
Does anyone have any suggestions on how to fix this or explanations as to why it happened in the first place?