background noise

so i just got a new mic but its not the mic, my previos mics and internal mics on my computer so the same thing, theres like high pitched squeaks but not as long as normal feedback. also the mic will just stop and start over and over mid sentance so it sounds kinda gaaped, its like it needs some noice to alwasy stay active otherwise whenever i finish a sylabble it just stops and waits for me to start up again. this is very quick but it sounds terrible

Audacity has a feature called Transport > Sound Activated Recording. Turn that off.