When I sing, others think I sound good but when I record, it doesnt sound good enough?

I sometimes have the same problem when i sing im 16 american..there are a few things that could be happening such as when you sing you can actually change the tone of your voive without knowing it meaning when you know that you are about to sing into a microphone you can be over doing it without knowing it or you can have a good singing voice but not a good recording voice which is very possible..practice makes perfect and when you get onto youtube the next time type that in "why do i sound diffrent recorded" or something like that i remember this man named eric aerneaux not sure of the spelling but he made a video of why this was happening if you go to his channel you will most like find it..good luck i wish you well